I replaced my battery last winter and now after I've parked the car and turned it off when I get in it again the radio is sometimes shut off. I don't ever turn it off. Last year when this started happening I went in for an oil change and they had to jump start my car. My battery was bad. It's happening again and I'm due for an oil change...go figure. Of course it's not covered under warranty too!! This shouldn't be happening again and is very frustrating.