That happened to mine a few years ago and the dealership had to replace the radio under warranty. It could not be repaired.
Were you by chance doing anything lately with the OBDII port? Running diagnostics scanner, code reader, making changes with AlfaOBD, or got some kind of driver behavior monitor from your insurance company in there? I only ask because I had been doing some monkeying around right before it happened to my radio too... but others told me it was not related/bad timing.
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