Spoke to Hyundai service technician last night. TOld him about this problem with TPMS light having a mind of it's own. He wanted to clarify TPMS malfunction light versus low pressure tire warning. I said yes, amber TPMS light goes on and off randomly. He said 2 main causes he has found for this is window tint and those foil windshield sun visors cause interference. A small pressure sensor is located inside each wheel. The sensor has a built-in transponder that broadcasts a radio signal to an external module. The foil in the sunshades interferes with the signal from the wheel and causes signal interference, causing the light to become illuminated. I have both in my car. Since the tint aint coming out and it's ceramic, gonna try and remove the foil visor. Hope that helps.