DCP

For some reason the nav screen has begun to flicker more than usual on my 06 TL and I am wondering if anybody knows a solution to fixing this problem. (warranty has expired). Everything works fine, but now and then the screen doesnt want to show a clear picture and instead a grey screen appears with some lines across it. I should also note that if I tap on the side of the h/u the pic on the screen comes back, but it flickers a few minutes later. Yes, I have read the threads out there, but there wasn't a clear answer to my question. Opinions to this problem and helping me fix this matter is greatly appreciated. Thanx in advance!!