My Tom Tom 6 02 keeps giving me dark screen.

Hallo Good People! I have a Tom Tom 6 02 which I use for my navigation in Utrecht, Netherlands. However, I have been having problems with it since there are times the screen goes completely black. I need this to be sorted out but I first think it is best to ask if there is anyone who ever experienced that and which solution was found. Could it be a software problem? Thanks in advance.
