I came out to start my 07 AV and nothing happened. I noticed the dome lights wouldn?t turn on and everything was dead. Checking my 7 month old battery and it was fully charged. While checking the cables coming from the batter the lights came on when I moved the negative cable. The connections to the battery were tight and clean so I knew I had a deeper problem. Taking it to the dealer, they found grounding connections loose and some corroded where they cleaned and tightened and it seemed it solved the problem. But about four hundred miles later, things started to get really crazy. The door locks started to actuate and not all at the same time, front doors then the back and they would this constantly. The instrument cluster and the radio/navigation would briefly go dark and then come back on and then turn off again. When the instruments would come back on I would get a message that the parking assist is off then disappear then it would say the traction control was off also. This is all occurring while doing 70 MPH on the interstate. I pulled off at the next exit and everything went back to normal when I came to a complete stop miles away from any dealer ship. Back on the interstate again and everything seemed normal again until I used my turn signal left or right it didn?t matter or if I pressed the brake pedal then I would lose all power to the instruments and radio/nav but after 3 or 4 seconds later they would come back on. No problems with the locks this time. I finally got the AV in the Chevy dealer but everyone is scratching their heads why I'm losing power. Just wondering if this is a wiring harness problem or what. Any idea or solution would be welcomed.