It's possible that you've got a worn out SD card, and there is a corrupt section on your map.
Sometimes, people have better luck with older applications. 7.903 isn't really needed unless you have a 8xx series map.
Try downgrading to app 7.162 or even to app 6.524. Your map isn't mapshare compatible, so there's not much value in the Navcore 7 application.
To downgrade, first backup per this link. Then delete all loose files on the tomtom drive (but not folders), then use winrar to extract the app link above and copy the contents onto the Tomtom, overwriting files if prompted.
I will give it a try ,just been in the toronto and hamilton area and the unit powers down , reset itself and freezes up in exactly the same areas of each city.Also when planning a route it will start to plan route then shows ERROR and stops.Almost threw the unit into Lake Ontario and bought a Garmin.
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