I have similar problems every time I use my Quest on the bike. It is fitted to a Garmin cadle with power wired directly to the battery via its own fuse. So far I have had multiple screen freezes, screens going blank and a high pitch noise when I removed it from its cradle, that lasted several hours!
This is a replacement unit as I was forced to go to Garmin and complain. I did try their email but they do not anwer and I was once on hold via their phone system for 24 minutes before someone took up the call. On a previous attempt I was on hold for 58 minutes!
I am at the point of threatening legal action to get my money back, but if someone has any ideas for a reset that works I would be grateful. I did pay for a unit I could use on my car and bike. I could have gone for a cheaper car only unit.