This is just started to be a problem. I setup my tomtom nav 5 with the bluetooth. All find but after the entended time I sent on my treo 650 to 3 minutes screen time, It shuts off and locks out my nav 5 and losts my directions. I can restart my nav 5 after unlocking my system as usual. I have brightcam I thinking it would be able to control the time of the screen on. No luck, Would use some help. There must be a way to disable the screen function to hold the tomtom nav 5 on. Please advise call me at 800-874-2236. Stranted in Arizona at the jr national Billiard tournment.