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Taken the full plunge and rugged smartphone ordered, so now I will start looking at apps in detail, but not here obviously. :)]
From main menu / up arrow / setup / system / interface / Garmin Spanner
On powering 680 then asks you if you want to go into mass storage mode, answering no allows Montana to run normally under power.
Thanks for the update, you have taken the correct course of action in returning the device as it's new.
Montana is as good as it gets in current models in my view, 276CX should be better but performance seems to remain problematical from reports.
I had similar problem a while back with my Montaba refusing to go into mass storage which turned out to be a troublesome SD card. The Montana booted into mass storage fine without it.
Probably won't help you but worth checking.
Not enough 'G's in my phone