2008 Trailblazer LS with intermittent problem of TPMS falsely activating on the dash cluster (tires are all at normal pressure), the key fob does not function (new battery) and the rear cargo door is locked- will not open when the vehicle is at rest or running, and will not unlock when the driver side unlock button is pressed. Able to manually unlock rear hatch thru the access hole. Everything returns to normal operation after the TPMS light goes out. I have been able to successfully reset the TPMS system for each wheel, but the TPMS dash light came back on later in the day, same problems with hatch and key fob, and then all was well after start-up the next day. This situation comes and goes with no seeming connection to anything. Haven't yet contacted the local Chevy dealer to see if the service guy has any inside TB info related to this. Anyone have suggestions?