Apparently somehow the 8.25 maps (or a mysterious alien force) causes it to shut-down after only 5 minutes if it's on battery power and you don't have a route planned and don't use it during that time - you get the same "10-second countdown" you did before when you unplugged it (assuming you have that option set 'on'). Maybe I just never had it sit more than 5 minutes without being in the USB cradle charging? Not sure.
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