There are a few possible reasons why the video feed may be slow, frozen or even disconnect while you are on a video conference from a location that doesn't have an enterprise-grade wireless connection. This may happen when working from home or from a remote office with a lower quality WiFi connection. 

WIFI ROUTER
It's important that your computer can pick up a strong WiFi connection from your router. Place your router off of the floor, out in the open and in a location that isn't blocked by walls or doors. Try moving your computer or mobile device closer to the router. 

Check the firmware of your router. It is possible that there is a software update that will help the router run more effectively. Check the router manufacturer's website for any updates.

You may want to invest in a WiFi range extender device that will increase signal strength further away from the router.  

If necessary, If your router has ports, use a wired connection to attach directly to the router.

BANDWIDTH
The recommended bandwidth for video conferencing is at least 1.2Mbps download speed and 300Kbps upload speed. Check your internet bandwidth using free sites such as Speedtest.

CLOSE OTHER APPLICATIONS
Open browser pages or apps on your desktop or mobile device also using the internet may be affecting the quality of your video call. Close out any open pages or apps.
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