How's this for a strange one! Reversed van this morning.....reverse sensor display came up on engaging reverse....and then stayed on! Couldn't operate any head unit functions....all I could see was an inoperable parking sensor display! Filled up with diesel so had to switch ignition off....switched back on.....No change.....screen still frozen! Engaged reverse when parking up.....bish bash bosh.....head unit starts behaving itself! Hmmmm??