AUX USB audio sadness: my analog stereo mini input works fine on my non-HK F56 2014 MCS. But the USB input is suddenly greyed out (unavailable); it used to work fine with iPod USB 30-pin as well as any FAT USB stick with MP3s-- until the ECU/radio/head unit choked (and proceeded to CROAK) on a lossless WAV audio file of 2116 kps. The only online suggestion I can find is to reboot the ECU. Does this mean disconnecting the battery? Does the ECU have a reset for the consumer? How do I disconnect the terminals? Any tips appreciated. If this head unit software theory is wrong, then it must be a hardware/port/wiring issue. If a car is under warranty, does this mean that the mere playing of high bit rate files (2216 kps) can crash your F56 ECU? If so, there should be a warning in print somewhere. Links? Tips? Thanks!