I used my tomtom 910 on a trip of about 500 miles. During the trip I first noticed tomtom seemed to be lost at times. It would direct me to take a turn off a major highway only to bring me back to the same highway. Then the mp3 player started hesitating. I noticed this took placed because the tt keep recalculating driving. I shut down the mp3 player and the unit still would suddenly recalculate. I was on I-75 going north and there were no construction detours. Turned the unit off while eating and the unit seemed to be ok for the last 100 miles. Anyone else experienced this?