I've had the F90bt for about 2 weeks. I noticed the screen blinks like its cutting on/off every few seconds while it boots up and it lasts for a few minutes until the unit is warm. I live in south florida so I didn't realize it until I headed north a week ago for the holidays and the temperature was around 50 at night. Seems to happen only when the temperature drops below 70 and lasts relative to how cold it is. Everything functions normally: touchscreen, radio, sound etc. I saw where someone else had problems with the touchscreen not working when it was cold but couldn't find anyone else with a similar problem. I'm trying to determine if this is a wiring installation issue or something inside the stereo that is shorting out the screen. Or if this is just normal for this unit?(which I doubt)

It has been well below zero here in Wisconsin, and no problems at all.

mines been alright have been at roughly -20 celcius and no problems so far knock on wood

-20 F here in Montana last week, no problems with mine.