I upgraded my Garmin gps map 62 s to a Montana 650 t about 8 months ago. It has work perfectly on many multi day rides since I got it. When I was out on Friday it shut down about 3 hours into the ride and now when it powers up it gets Garmin Logo up and tries to load maps then powers down. This happens when on battery power or on the powered cradle. Jonny Appleseed GPS said Garmin will replace it as he couldn't get it to respond in the shop. So no worries with back up service. Just wondering if anyone else had this happen with a Montana 650 t.