Got my mirror today and just got back from a test drive. When the car is moving, it goes through power up every few seconds (blank, "GPS mirror ready"). Sometimes it may stay on for 30 or more seconds at a time (stays on when stopped) or, more rarely, stay off for several seconds. The red light on the cigar adapter always remains solid. The culprit appears to be the power connection to the mirror itself. When I jiggle or push it down, I can usually get it to go blank/power cycle. One odd thing is that the connector doesn't go all the way in (part of the metal cylinder is visible). I've used light to moderate force to make it go all the way in, but I don't want to excessively force it.
Any comments or suggestions are most welcome. I purchased the mirror at buyradardetectors.com