It was the AC primarily, but there were a combination of things including sensors, software and a cable. This then got it working to some extent, and they once took my car for 2 weeks for extensive testing. The service manager then proudly announced it was fixed as he had had it running for 2 weeks perfectly. What we stumbled upon completely by accident was the AC issue. I collected the car and all was well for a few days, I then noticed that all the climate control etc was off. As soon as I turned it back on, the SS immediately disabled and stayed off. I tested this for a couple of days, AC off - perfect SS, AC on - no SS at all, it never even activated. Phoned the dealer and spoke to the manger who asked me to bring it in, we went for a short drive and I showed him. Apparently he never uses AC or climate control in his car (I’ve had ‘his’ car as a loaner a few times and it is always off). Anyway, they took it back, changed a ‘board’, and it’s worked since. Try it. Turn everything off, everything, and see if you can get it to work. Then start turning stuff on one by one and see if anything turns it off.