Car acts dead after it gets hot...

I see you don't have a battery hold down. You can (and should get one) get an inexpensive one at an auto parts store. If you ever hit the brakes hard or someone hits you, the battery will fly around. Not good.

No I don't. I keep meaning to get one. I have a couolebor tow straps in the garage, maybe ikk throw the camo one on the battery. :)