Sat Nav screen gone bonkers (Z4M)

My Sat Nav screen went bonkers tonight! Never happened before and turning the ign off & back on again seemed to have sorted it. Anyone else had this?

http://thumbsnap.com/v/ejg1veIM.jpg
 
Never seen that one before. Dealer job as you are under warranty, don't leave it. Take the picture as evidence as they will not be able to replicate it!
 
looks like a GPU overheating issue to my untrained eyes.. did you have the heater on for a long time?
could be it got too warm and crashed out... (same thing happens on my old laptop if I cover up the vents for a while)...
 
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