While driving home last night everything was fine...all of a sudden , all my dash lighting went dim. Display panel, speedometer panel, essentially everything that is lighted at night. I had to use the (-+) button on the left panel to get the light back up to a usable brightness. Can anyone explain what might have happened? I have searched all my manuals and can't find anything related. I might have missed it somewhere. Sure was a weird situation. Also, map background has turned "black" used to be "white/grey" until this happened. Appreciate any help.