What does this computer image mean? A/C runs fine and error message resets when car is restarted.

cost 250 for parts and 350 for labor what do you think

On several occassions, while using the navigation system, the navigation and radio went dead, warning message that there was an error with the display, and the car lost power to the wheels (although engine responded). Each time (so far), shut engine off and restart.. problem is resolved. This sounds to me like a component overheat problem but it is affecting the car's drivability - has anyone else had this issue? What is the fix and how costly is it?

I have a very small dent in the front right quarter panel that may be easily popped out if I could remove the headlamp? Is this easily done? Or any other suggestion as to how to get behind the quarter panel?