Zoom/Teams unstable internet connection

Hello, I am having the same issue. Out of the blue, after several years of problem-free Zoom use on my Xfinity connection, I am now experiencing unstable internet connections everytime I host a Zoom meeting. The app crashes and reboots over and over again. Rebooting the router does not resolve the problem. Uninstalling and reinstalling Zoom did not resolve the problem. I cannot practically use an ethernet cable in my office. Is there a fix for this?