Though, we don't use Home for camera viewing , we use the Nest app
EDIT... might want to post in a Google forum
On top of that, we have four Wyze cams ... using Wyze app to view those ... zero issues
I'm having the same audio and video issue with watching playback of any event that I get through the Home app. If the app is still running in the background and you press the volume button to bring out the media volume slider, you can see it jumping up and down on its own. If you drag down the notification bar twice, to see the multiple pages of setting buttons, you can see the 3 'page' dots at the bottom will tick back and forth randomly if you're on any of the other pages and sometimes buttons will be turned on or off on their own as if the phone is reading random inputs from the screen software. It's super weird. Sometimes pulling up recent apps and hitting "Close All" won't work and I have to open the Home app and end it on its own with a swipe up from the recent app overlay.