In 2014 the original owner reported a problem with the radio and it was fixed under warranty by updating the software. Last autumn the radio would not go past the start screen on switch on. It was booked in to be fixed but on the day before I had to put in a new battery. This removal of volts to the radio for a few minutes did a reset and it then worked perfectly until today.   While driving today, the radio suddenly stopped- no sound and no action from the touch screen. Turning i