I came out of a restaurant today and got in my 06 Tahoe to go home. Went to turn on my bose/ gm radio and got an alert across my navigation screen saying "THEFTLOCK ACTIVATED". Now I understand that this is a theft deterrent but how does the owner de-activate theftlock on the radio. I am sure nobody tried to break into the truck for the 25 minutes I was at the restaurant. I wonder why it self- activated and will this be a recurring issue? Every thing else in the truck seems to work. Will I have to go to a GM dealership to have this de-activated?