I just want google to know there Nest routers connect to Bluetooth and play audio for a couple of days and then stop playing Bluetooth audio. Google needs to fix this issue, the only way to temporarily fix this is restart the nest wifi point. There is no long term fix to this yet (hopefully).
Sorry for the late response here, but I wanted to check in to see if you were still having this issue and to see if you have done any additional troubleshooting so far. If you still need help, let me know and I'll be happy to work on this with you.