[KeyaKing]

I have a 2007 Cadillac STS. My factory stereo isn't working. The only way it work is if I disconnect the negative part of the battery then plug it back in. It will work for the entire car ride but if I turn the car off and stay out if it for longer than 10 minutes it goes off again until I repeat the steps of disconnecting the negative part of the battery and letting it reset... What's the problem help please