Mine flickers every time and about every 10th or so ride, the "browse" button will push itself and start scrolling through radio stations and eventually change the station. It's like a ghost is operating it. Whenever this happens, my NAV won't stay pinpointed to my location either. I've had it in the shop 3-4 times for "software updates" that obviously don't work. At last communication, they were supposedly working on a new software update that is supposed to fix the symptoms I'm having. That has been about 6 weeks ago now and no word back.
Frustrating as hell.