I own a 2003 Cav coupe with the same exact issues... So far my car has been to four different shops. The first one had no earthly idea, the second stated they got a code from the computer (U1064), the third stated it was the BCM(Body Control Module), and finally, the dealer stated it was a faulty instrument cluster. Well, on the dealer's recommendation a brand new instrument cluster was installed. This did not solve the problem. Now the dealer is saying that the problem is really the PCM... Can someone please tell me if they have successfully fixed the issue with the cluster "resetting" as you are driving down the road, and if so HOW?! Thanks!