This happened to mine recently. I started a thread
here.
I also had Bluetooth playing up and Radio/CD/Audio stopped.
I got audio back by removing and re-seating fuse #72, but the screen stills goes yellowish and Bluetooth still not functioning correctly.
The weather here is NOT cold. (Around 27C today).
Battery reads 13.8-14 when running and 12.8 when stopped (Via OBD) so I think this is fine.
As the screen also doesn't open any more either, I'm more inclined to think it's a connection/screen issue?