Very good to know about disabling the progress bar . Thanks. It is possible the relay is failing. Its on my list to check before installing the new PSU. The bed wasnt cooking when it failed. Felt about the right temp .It was printing PLA so it was only at 60 degrees and the room was warm. It is weird that the thermal runaway was at the end of the print as the bed pulls more current in the beginning of the print. Still not sure the thermal runaway was because of the bed though. I do have both relay and Rumba on standoffs. The 12Ga silicone wire i use has very high strand count. I could barely fit the wire in the screw terminals.