I have had my GO720 for about 1 1/2 years and have had no trouble with it at all and have travelled around USA and Canada with it without a hitch. I update it weekly. This week however I connected to the computer to get a mapshare update and the unit immediately turned off and would not respond. It did not connect to the computer. I could not get the unit to start up no matter ho many times I depressed the reset button or on/off button. TomTom help only told me it was out of warranty, offering no other help or information. I played around for about 1/2 dressing the reset and holding down on/of button and it started right up perfectly. Stupidly I attempted to reconnect to the computer again thinking I had experienced a one time glitch but again the same thing. Again 1/2 hour and many, dressions of reset etc and it started up out of the blue again and is working perfectly although I have not attempted to reconnet to the computer. Any ideas?