I didn't have the playback issues. Just the usual Nest glitches were some video playback sometimes gets stuck because of buffering. Often rebooting the app helps. I remember I had an issue like this with a OnePlus phone once. Changing the colour/display settings helped there. Not sure if the same applies to Samsung phones.
You can find the auto blocker in your settings and then just use the search function. There is a toggle in the security and privacy settings. Remember to restart the phone afterwards.
