Electrical issue

I have a 2004 RX8 since it was new with 70000 miles on it. When the engine gets hot the tripmeter goes to zero the radio goes out and the gps stops working along with the remote not working. Check engine light comes on and cars runs fine. Turn off engine wait 6 hours and start up and everything works again.

The dealer has replaced the battery cables and still can't find anything else.

Any ideas would be helpful!!!!