Zoom video shuts down in middle of a meeting

Hi I am hoping you can help me with a problem that has just started. I am a long term zoom user and have not had problems with my camera during zoom meetings until about 3 days ago. Now I find that at varying times during zoom meetings my my zoom video suddenly stops. This is happening when I am not the host but streaming a meeting where someone else is the host. The times when this happen vary. When I try to go back into the camera I was using it isn't there. All that shows up is a virtual camera that refers to my smartphone as the camera. The sound isn't effected that come through a separate usb microphone. I am using a windows 11 HP 64 bite operating system 12th Gen Intel(R) Core(TM) i3-12100 3.30 GHz with 8 GB ram. I have tried two cameras a Razer kiyo and a logitech C270 but had similar problems with both webcams. I am able to go back into video using my smart phone as the camera. I have tried using the camera app when my camera is connected by usb on windows 11 to see if the camera stops there after a period but I have not had problems with the camera shutting down unexpectedly. I ran this app for 40 minutes today without difficulties. Windows is up to date and I am on the latest zoom version 6.3.6 (56144). Any help would be appreciated.  Thanks