I felt the same way. Couldn’t see how problems with the touch screen meant I couldn’t switch to the radio. But my screen and head unit would become 100% unresponsive. Sometimes I could manage a reset and it would sort of work for a bit and then get worse again.This makes no sense at all for me but thanks, I seem to have the same problem then.
I guess it’s probably a matter of the faulty digitiser registering constant input to the head unit to the point that it crashes.
Either way it’s a cheap fix.