Why does Zoom keep freezing? How to determine whether your network is the problem

By Michael Obraitis, Managing Partner, and Michael Dale, CEO·Published August 12, 2026·Last reviewed August 2026·ADAM Pulse Knowledge Base

You are in an important Zoom meeting.

Someone begins presenting.

Then:

The video freezes.

Audio breaks up.

The screen share becomes blurry.

People begin talking over one another.

Zoom displays an unstable network warning.

Someone says:

“Zoom isn't working.”

But is Zoom actually the problem?

Maybe.

But poor Zoom meeting quality can also be caused by conditions between the user's device and the Zoom service.

That path can include:

Computer → WiFi or LAN → Switch → Firewall → WAN → ISP → Internet → Zoom

The challenge is determining where the quality problem actually begins.

This guide explains how to troubleshoot Zoom freezing, poor audio, unstable video, disconnects and other meeting quality problems and how to determine whether your network is contributing to them.

Why Does Zoom Keep Freezing?

Common causes can include:

• Unstable internet connection
• WiFi problems
• Packet loss
• High latency
• Jitter
• Insufficient bandwidth
• Network congestion
• Firewall issues
• VPN routing
• Computer resource limitations
• ISP problems

The first troubleshooting rule should therefore be:

Do not assume the application is responsible until you investigate the network and endpoint.

What Network Conditions Affect Zoom?

Three measurements are particularly important:

Latency

Packet loss

Jitter

Bandwidth also matters, particularly when sending and receiving higher resolution video or multiple video streams.

Zoom itself uses these measurements in its quality diagnostics. Zoom's QoS statistics include latency, jitter and packet loss for audio, video and screen sharing.

How Much Bandwidth Does Zoom Need?

Bandwidth requirements depend on the meeting configuration.

Zoom currently recommends, for example, approximately:

1:1 high quality video: 600 Kbps up and down

1:1 720p HD: 1.2 Mbps up and down

Group 720p HD: approximately 2.6 Mbps upstream and 1.8 Mbps downstream

1080p HD: approximately 3.8 Mbps upstream and 3.0 Mbps downstream

Zoom automatically adapts bandwidth use based on available network conditions.

This is important because:

A Fast Internet Connection Does Not Automatically Mean a Good Zoom Experience

You may have a 1 Gbps internet connection and still experience:

• Packet loss
• Jitter
• WiFi interference
• Congestion
• Routing problems
• Firewall issues

Bandwidth is only one part of network quality.

What Is Zoom Packet Loss?

Zoom transmits audio and video as network traffic.

When packets fail to arrive, quality can deteriorate.

Users may experience:

• Frozen video
• Missing audio
• Robotic audio
• Blurry video
• Delayed screen sharing
• Meeting instability

Zoom's own QoS statistics track packet loss separately for audio, video and screen sharing.

What Is Zoom Jitter?

Jitter describes variation in network packet timing.

Real time applications need relatively consistent packet delivery.

If packets arrive irregularly, audio and video quality can suffer.

Zoom includes jitter as one of its native network quality measurements.

What Is Zoom Latency?

Latency measures network delay.

High latency can create:

• Delayed conversation
• Slow interaction
• Awkward pauses
• Participants talking over one another

Zoom provides latency statistics that administrators and users can use when diagnosing meeting and phone quality.

Why Does Zoom Say “Your Internet Connection Is Unstable”?

Zoom Workplace can display network stability indicators and unstable network messages when it detects network quality problems during a meeting. Zoom also allows users to inspect current network statistics from the Workplace application.

Treat that message as a troubleshooting clue.

Investigate:

• WiFi
• Internet circuit
• Packet loss
• Latency
• VPN
• Firewall
• Local congestion

Why Does Zoom Freeze but My Internet Speed Test Is Good?

This is extremely common.

A speed test measures network conditions during the test.

Your Zoom problem may have happened:

Twenty minutes earlier.

Or packet loss may be intermittent.

Or the WiFi connection may be unstable.

Or the network path to Zoom may behave differently from the speed test destination.

A successful speed test does not prove that the network was healthy during the affected Zoom meeting.

Why Does Zoom Freeze on WiFi?

Wireless networks introduce additional variables.

Possible problems include:

• Weak signal
• Interference
• Congested channels
• Distance from access point
• Access point capacity
• Roaming
• Local RF conditions

Zoom itself recommends comparing WiFi with a wired connection when troubleshooting wireless quality problems.

That is an excellent diagnostic test.

If Zoom performs well wired but poorly over WiFi, investigate the WLAN before blaming the ISP or Zoom.

Should I Use Ethernet for Zoom?

For important business meetings, a wired connection can eliminate many WiFi variables.

That does not mean WiFi cannot support excellent Zoom meetings.

It means wired testing is a useful troubleshooting technique.

Compare:

WiFi experience

with:

Wired experience

If the problem disappears when wired, you have significantly narrowed the failure domain.

Can a VPN Make Zoom Slow?

Potentially.

A VPN may change the network path Zoom traffic takes.

Depending on configuration, it may introduce:

• Additional routing
• Encryption overhead
• Congestion
• Security inspection
• Additional latency

Zoom's own WiFi troubleshooting guidance recommends turning off a corporate VPN when it is not required for the meeting as one troubleshooting step.

Enterprise organizations should make that decision according to their own security requirements and policies.

Can a Firewall Cause Zoom Problems?

Potentially.

Investigate:

• Firewall resource utilization
• Security inspection
• Traffic policies
• NAT
• Routing
• WAN interfaces
• QoS
• VPN configuration

Do not simply disable security controls to troubleshoot.

Use logs and measurements to determine whether the firewall is contributing to the problem.

Does QoS Help Zoom?

Quality of Service can help organizations prioritize real time traffic when networks are congested.

Zoom supports DSCP marking for audio, video and screen sharing, allowing network administrators to classify Zoom traffic for QoS handling.

However:

QoS cannot fix a broken internet connection.

It does not eliminate:

• Carrier packet loss
• Weak WiFi
• Circuit failure
• Severe congestion outside your control

QoS should be part of a properly designed network strategy.

How Do I See Zoom Meeting Network Statistics?

Zoom provides meeting statistics that can help determine whether the issue involves network, audio or video performance.

Depending on the account and administrative capabilities available, Zoom also provides Dashboard visibility into meeting health and quality.

That data can help answer:

Was packet loss occurring?

Was latency high?

Was jitter elevated?

Was CPU usage a problem?

Did the participant disconnect and reconnect?

What Is Zoom Dashboard?

Zoom Dashboard provides administrators with visibility into meeting and webinar health.

Zoom allows administrators to review health and issue information related to conditions such as:

• Unstable audio
• Unstable video
• Screen sharing quality
• CPU usage
• Disconnects
• Reconnects

Historical meeting information can also be reviewed.

This is an extremely useful troubleshooting resource.

What Is Zoom Quality of Service Subscription?

For organizations that need deeper integration between Zoom telemetry and their broader monitoring environment, Zoom offers Quality of Service Subscription, or QSS.

QSS can deliver near real time QoS telemetry for Zoom Meetings, Webinars and Zoom Phone into third party endpoints.

Quality metrics can include:

• Bitrate
• Latency
• Jitter
• Packet loss
• Resolution
• Frame rate
• CPU usage

This creates an interesting opportunity for sophisticated network operations.

Instead of investigating:

Zoom

and:

The network

separately, organizations can correlate application quality with network behavior.

Why Is Correlating Zoom and Network Data Powerful?

Imagine:

2:14 PM

Zoom reports increased packet loss.

At the same time:

ADAM Pulse detects increased packet loss on the site's WAN connection.

Firewall remains healthy.

Gateway remains healthy.

External latency increases.

Now the investigation has context.

Compare that with:

User: “Zoom froze yesterday.”

The first scenario provides actionable evidence.

How Do You Troubleshoot a Bad Zoom Meeting?

Start with:

1. Exact meeting time
2. Affected participant
3. Location
4. Wired or WiFi
5. VPN status
6. Zoom quality statistics
7. CPU or endpoint health
8. Local gateway status
9. Firewall status
10. WAN performance
11. Packet loss
12. Latency
13. Jitter
14. ISP performance
15. Historical network conditions

The objective is to correlate the user experience with the underlying infrastructure.

What If Only One Zoom User Has Problems?

Investigate the user's:

• Device
• WiFi
• CPU
• Local connection
• VPN
• Headset
• Camera
• Network path

If 100 users are healthy and one user is not, a company wide WAN outage becomes less likely.

What If Everyone at One Office Has Zoom Problems?

Now investigate the shared infrastructure.

Potential areas include:

• Office internet circuit
• Firewall
• WiFi
• LAN
• SD WAN
• VPN architecture
• Local congestion

Shared symptoms often point toward shared infrastructure.

What If Multiple Offices Have Zoom Problems?

Now look for common dependencies.

For example:

Same carrier

Same firewall policy

Same VPN architecture

Same geographic region

Same network change

Same Zoom incident

Centralized monitoring becomes especially valuable here.

How Do I Know Whether Zoom or My Network Is Down?

Check multiple sources.

Ask:

Are other internet applications working?

Is the local gateway healthy?

Is the firewall healthy?

Is the WAN healthy?

Are multiple external destinations reachable?

What does Zoom Dashboard show?

Are multiple locations affected?

Avoid assigning fault before collecting evidence.

Why Historical Monitoring Matters for Zoom

Suppose:

11:02 AM

WAN packet loss begins.

11:04 AM

Zoom video freezes.

11:06 AM

Audio deteriorates.

11:09 AM

Network recovers.

11:25 AM

IT begins troubleshooting.

Current network status:

Perfect.

Without history, the evidence is gone.

With historical monitoring, the network conditions can still be reviewed.

Zoom Already Provides Excellent Application Visibility

This is important to the USA Telecom and ADAM Pulse story.

We should not position ADAM as replacing Zoom's diagnostics.

Quite the opposite.

Zoom provides powerful information about the Zoom experience.

ADAM Pulse provides visibility into the network environment surrounding that experience.

Together, they can create a much more complete troubleshooting picture.

The ADAM Pulse Plus Zoom Approach

Think about the troubleshooting model as two layers.

Zoom

What happened to the meeting?

• Packet loss
• Jitter
• Latency
• Bitrate
• Resolution
• Frame rate
• CPU
• Participant quality

ADAM Pulse

What happened to the network?

• Gateway
• Firewall
• WAN circuit
• ISP
• Latency
• Packet loss
• Availability
• Historical incidents
• Multi site patterns

Now correlate them by:

Location

and:

Time

That is where troubleshooting becomes much more powerful.

From “Zoom Is Broken” to Root Cause Analysis

Instead of:

User: Zoom keeps freezing.

Help Desk: Restart Zoom.

User: Still happening.

Help Desk: Restart computer.

User: Still happening.

Help Desk: Call ISP.

A mature troubleshooting process asks:

When did it happen?

What does Zoom's quality data show?

What was the network doing at that exact time?

Was the problem local, WAN related, ISP related or application related?

That is root cause troubleshooting.

USA Telecom, Zoom and ADAM Pulse

USA Telecom helps organizations deploy, support, train and optimize Zoom while ADAM Pulse provides visibility into the network infrastructure supporting critical communications.

That combination allows us to look at both sides of the user experience:

The communications platform

and:

The network delivering it.

The objective is not simply to tell a customer:

“Your Zoom meeting was bad.”

The objective is to help determine:

Why?

Stop Guessing Why Zoom Froze

A frozen Zoom meeting leaves clues.

Zoom may have quality statistics.

Your firewall has information.

Your internet circuit has performance characteristics.

Your network has a history.

The challenge is correlating those sources.

ADAM Pulse provides managed network monitoring designed to help USA Telecom customers understand the network conditions surrounding Zoom, VoIP and other real time cloud applications.

See the Zoom experience.

See the network underneath it.

Correlate the evidence.

Find the problem faster.

Learn more about ADAM Pulse and talk with USA Telecom about Zoom optimization, network monitoring and communications support.

Frequently asked questions

Sources

• Zoom — Using the Zoom Dashboard. Administrator access to per-meeting latency, jitter and packet loss.
• Zoom — Zoom system and bandwidth requirements.
• Cisco — Understanding Jitter in Packet Voice Networks. Delay, jitter and packet loss as the determinants of voice quality.
• Cisco — Troubleshoot Packet Drops. Congestion, buffer exhaustion and interface errors as drop causes.

USA Telecom Consulting LLC is a Service-Disabled Veteran-Owned Small Business running a 24/7 NOC. We monitor networks, circuits and firewalls for regulated and defense-supply-chain organizations.

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Prepared by ADAM Pulse (USA Telecom Consulting LLC) — managed AI governance, network, and NOC services. Support: (888) 989-4872 · support@adampulse.us