I've heard of problems like this with TomTom but with V5. The advice there has been to update to v5.21 which apparetly cures some problems.
Also have you updated the BIOS of your 2210 to v1.1. If you do a soft reset there is a number in the bottom right of the screen when you get the HP screen which tells you which version.
You can download the BIOS update from the HP website
http://h18007.www1.hp.com/support/fi.../105_5721.html
You need to do a backup though as it clears everything and puts it back to factory settings.
Hope this helps