I had to reread all of my posts to get back up to speed. I have not found a solution to the Freezing display. For my new/used 2005 Excursion Diesel that I have installed the same F900 BT I bought a rear view mirror with a display and I bought a used rearview mirror from E-bay and cut them both up and combined them together with some bondo and black paint. The new mirror looks like it came with the car. Your thought about power coming from the 12v from the car may be on to something,but my backup camera gets its power from my reverse light in the tail light assembly.
I'm still stumped