Problem - Radio Resets and Loss of Memory

The problem I'm having is as if someone has removed my battery while I'm away from my car. I get back in, the radio has reset and I have to enter the security code, I lose the seat memory and it affects the keyless entry too. Anyone else hear of this problem. Of course the dealer won't do anything since they can't duplicate the problem. It's so frustrating. Any help is appreciated! Thanks!