I am sorry buit I have never had this problem. What does the warning say? POI is, of course, Points of Interest. Perhaps that file has been corrupted somehow. If you have a backup of your IGO files perhaps you could restore it to Factory and start again. I hope that I may have given you something to work on. My unit occassionally does something odd one way or another but it is never permanent. All electronic devices have some glitches, just look at the problems with "Windows", but millions of people still use it every day, including me.
For my needs, the IGO500 is perfect, not faultless, but perfect for me.

"Stopped working properly" does not tell me much! I assume that you have tried the "reset" function. I have needed to use that a couple of times to reboot the unit. It has always done the job. If that fails, you could try leaving it turned on until the battery goes completely flat and it shuts down. Leave it for a few hours, try turning it on again to see if the battery is REALLY flat. If not flat, leave it on again until it shuts down again. Leave it for a day or so and then recharge and reboot it. This can clear any glitches out of memory. If that all fails and you have a backup of the system files you could restore them from your backup. I keep a backup of the complete file system on my PC and regularly backup the "SAVE" file to my PC as this is the one that changes each time you use the unit.
I hope that I may have been of some help to you.

Not to0 sure what the problem was.I bought it inside and connected it to my lap top but thought better not do anything until i know what to do.I put it back into my car and it said searching for satellite conection and away it went.No further problems????????