A likely cause is that the battery is "dead" ... i.e. no longer holds a charge. The GPS runs on battery power, even if it is plugged in. It will work even if the battery holds a (small) charge. But if the battery doesn't hold much of a charge anymore, the device may go into "power saving mode" ... that's where you'll notice the screen brightness goes down, the screen color changes, etc.
If this is the case, you'll want to change the battery.
If this is not the case, it is possible that the navigation software is corrupted. And you'll want to restore it from backup, or download a fresh version (from TomTom.com).
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