Internet Instability when using video conferencing

I am having issues with my internet being instable when trying to do video conferencing. I'm testing my connection and speed on Xfinity and currently and it says I have 519.0 mbps download speed and 22.5 mbps upload speed, and a  "Blazing Fast" connection. 

The rest of my internet service is fine and working as expected, very fast. Can have multiple tabs open and work on various things at once. I'm able to stream on apps and my download speeds are very high. But whenever I enter a video call, my connection drops and I need to restart the internet to get back online. 

This was initially caused by an outage we saw about a month ago due to some bad weather and severe winds, which disrupted my service for a few days. Since then video conferencing has been very unstable and unusable. Which is incredibly frustrating as I work from home and need to make these daily. 

When I chatted with Xfinity assistant, they could see nothing wrong with my connection. Can I please get some assistance on this issue? Do I need to have a technician come out to inspect my setup even though Xfinity is saying my connection is good and fast?