I have a 27" Toshiba TV29C90 that has a habit of the screen cutting out(going black) while the sound continues to work. Sometimes i can get the picture back by tapping it on the side. This happens during the spring/summer(my guess is that humidity has something to do with it)..During autumn/winter the problem does not exist. Anybody have any idea as to what the problem is and what i could do about it?