I have had a problem with my rider switching itself on and off whilst on the move.
I have found that the docking station security bolts that hold the mounting plate to the docking connector has started to crack in the recess around the top 2 bolts.
This allows the back plate to flex and in turn disconnects the 4 point connector.
I have spoken to TomTom on their UK contact number and they have arranged for UPS to pick it up for repair. They are quote 4-5 days turn round.
TOMTOM UK Customer Services
08451610009
Monday - Friday: 08:00 to 18:30 GMT
(every first Tuesday of the month: 09:00 to 18:30 GMT)