Doug -
First make sure you've got the latest firmware on the zumo. Use WebUpdater (can download it from Garmin's site), and don't stop updating until when you try to there's nothing left to update. There were some firmware revs that had some real stability problems.
Once you've got the firmware updated, then clean up all the electrical contacts. Get some dielectric grease. Take the battery pack off, rub some of that grease on the battery terminals and the zumo battery terminals, and reinstall the battery. Put some grease on the bottom terminals that attach to the bike mount, and put some on the pins on the bike mount as well.
At the end of all that, I think your shut-off problems will be a distant memory. (I had the same issue with the same Zumo, and all of the above cured it completely).
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