Have Go 620 which I have used for several years without problem. Recently the device started turning itself off and then rebooting while traveling. Then while still on the road the recovery mode screen came up and I no long had access to the device. No message, nothing to indicate anything wrong. Connected to computer, at first not recognized. Did hard reset and then computer started downloading recovery. When done the GO 620 rebooted and went into a loop with showing the recovery mode and the system again downloading a recovery file, over and over all night long. Is it possible that battery has gone bad and system glitched and now device does not install recovery correctly? I can never get back to navigation screen.