I've read several old threads about audio issues and music not playing. My situation is music playing when it's not expected to play.
When I returned home, got out of the car with the key, and closed the door, the audio started playing. It stayed on for about 30 seconds then turned off. A few moments later I opened the boot and closed it using the lock button. When the hatch closed music played again but only for 5 seconds.
Earlier on my drive the audio (YouTube Music) would start & stop. I thought I was in a good reception area so I rebooted the IHU. Still had the problem. However at home the car picked up my wifi fairly quickly, which is unusual. Maybe the ghost was playing the music to taunt me?
When I get some time with good internet connection I'll see if I need to reboot the IHU again and/or the antenna.