I fear I have the same issue. Driving to work yesterday the heat was fine. On the way back I was just getting cold air even after rebooting and turning it on and off manually.Oddly enough, before my drive home, I received a message that a service ticket was created for me and closed remotely by the local SC. Called the SC to inquire about the service ticket and they mentioned they received a new update but checked my car remotely and it didn't require it so nothing was done. Got home and checked the service menu and I have a fault code: vcright_a262_PTCFaulted
Sounds like PTC failed 5 months after warranty