Usually when you see low battery like that it means the battery itself needs to be replaced at it can't hold a charge or enough of a charge to be usefull. If you unit is over 18-24 months old then th e battery is most likely the problem. This will happen even if you have always used external power as the battery doesn;t get properlly cycled enough.
It is possible that it is the power source you are using is too low but sounds more like the battery is the problem.
If you have warrenty the battery should be replaced by Magellan. If not a replacement battery is about $30 and is something you may be able to do. You need to remove the back cover and unplug the old battery and plug in the new one and put it all back together.
Here is one link for a battery but there are other just search for Maestro 3210 battery with google or bing and you should find a few places that offer them.
http://www.batterymart.com/c-magellan-maestro-3220-gps.html
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