I went to start my vehicle no power at all.. weird nothing ever happened like that before. so i get aaa to give me a boost. i get to my destination. go to get back in my car and leave. car dead no power at all. get towed to the dealer. battery check was good. they couldn't find out the problem. then the car would get jump started but wouldn't turn off when you press the button only the auxiliary things would power off. the dealer is telling me it's water damage but how? it's garage kept..