Head Unit

Ive did a few searches but hasnt helped me yet.
Lost my back up camera(black screen), noticed I have no clock and my volume is alot lower then normal. Might be other things but havnt noticed yet.
Wasnt messing with unit, just a normal drive to work...was cold today had the defrost on high for awhile.
Should I look in the back of the unit for connection issues?
Didnt think Id miss the camera but a big truck with a cap...kinda want it.
2014 sr5 4x4.

 

Wasnt going to tear into it until the weather warmed up...thought I might break some plastic.
About 3 days ago it just started working again..clock, volume and backup camera.
Think I will take the unit out once the weather warms up but other then connections or a ground not much I can do.