The touch screen controls on my GW-52 does not always function. On a number of occasions, I've been able to set the device up to record a session, by unlocking the screen by simultaneously pressing Start and Mode and then starting the session by simultaneously pressing Start and GPS. The unit has then records the session without incident. However after the session I am unable to unlock the screen by simultaneously repressing Start and Mode and hence i can't stop the unit from recording my trip home in the car. The only way I can unlock the screen is to allow the battery to run flat, recharge the unit, after which the touch screen begins to work again

Has anyone else had this problem and been able to solve it?