I've had my quest 2 just over 3 weeks now and I'm recently ran into the problem of the quest perma freezing during games. 
I play linked to my desktop 90% of the time and the game plus steam vr will still being running on my desktop when it happens. Even tracking the movement of my headset, yet the image in the headset itself is frozen and if I look off to either side it's just black. 
The only fix is to do a full reboot then reconnect to my desktop. They don't seem to have the issue under oculus troubleshooting either. Anyone had this before or know of any solutions?