First, Check Whether Zoom Is Actually Down

Your video freezes, the audio stutters, and your first thought is that Zoom is down for everyone. Check before you start pulling cables. Open status.zoom.us in a browser or look at a site like Downdetector. If Zoom reports an incident, or thousands of users are complaining in the last hour, the problem is on their end — wait it out and you can stop troubleshooting.

A faster way to tell: ask a colleague in a different city to start a test call with you. If they connect cleanly while your screen stays frozen, the outage is local to your network or your device, and the fixes below will get you moving again in a few minutes.

Fix the Frozen Picture: Camera Permissions and Bandwidth

If Zoom is healthy, the fault is closer to home. Start with the camera: on Windows, open Settings > Privacy & security > Camera and make sure access is on; on macOS, check System Settings > Privacy & Security > Camera. Then open Zoom's Settings > Video and turn off HD — a 1080p stream needs about 3.8 Mbps, so switch to standard definition if your Wi-Fi dips below 5 Mbps. Run a speed test at speedtest.net while your call is active.

Fix the Sound: Pick the Right Mic and Speaker

Sound problems are usually a device mix-up, not a failure. Click the arrow next to the microphone icon in the Zoom toolbar and pick the exact headset or speaker you are using. Then open Settings > Audio and run the test call — Zoom plays a recording and lets you hear yourself. If audio still stutters, check Task Manager (Windows) or Activity Monitor (Mac) for apps eating CPU and close them; Zoom needs a fair share of a modern CPU just for a group call.

The Bottom Line

If nothing above helps, quit Zoom completely — right-click the tray icon and choose Quit on Windows, or press Cmd+Q on a Mac — then reopen it. That clears a surprising number of glitches. Reinstall the app as a last resort. Nine times out of ten, one of these fixes gets your call running again before the meeting host has to reschedule.