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My 2007 vert would do the same thing. It would resolve itself. I believe it is a connection problem. I just never had the time to take it into the dealer.
The display on my 2005 periodically just went blank - - sometimes it came back on by itself, other times responded positively to a sharp 'thwack' of my fist.
I began thinking sooner or alter I would probably crack the display, so took it in to the dealer- they replaced it under my extended warranty - - hasn't been a problem since.