I see that this thread is a little old but I just wanted to chime in and say that I am also having this issue. My 14’ Corolla has 74k miles. It’s an LE premium plus. About a week ago it started looping and hasn’t stopped. I took it to the dealership and at first they couldn’t figure out what the issue was, then they called me back 4 hours later and said that there was a short that fried my radio/computer. They said that I need a whole new radio/computer system, about 5k to fix. I do have an extended bumper to bumper warranty good till 100k miles and the dealership said that the policy I bought covers all high tech components so I’m really hoping this is covered. Otherwise I just wont have a radio anymore, still paying on the car for 2 more years. This really sucks.
So what exactly is going on? Someone in the thread mentioned that they will tell you it’s a short but it actually isn’t? The service advisor said my phone/phone charger plugged into the USB port could have caused the short but that seems unlikely. Does anyone know what the actual issue is?