TomTom Navigator 5 Crashes Palm Treo 650

Hello,
I just installed TomTom Navigator 5.21 on my Palm Treo 650. When running TomTom if my device goes into Auto-Off mode to save power, it resets itself (crashes). I tried installing older TomTom versions, no luck. However, I managed to fix this problem by installing the actual TomTom launcher to SD card with the help of utility called Card Launcher. It stopped the crashing at Auto Power Off mode, but TomTom does not save any changes I make anymore, such as favorites, routes etc.....
I installed TomTom Launcher back to RAM and somehow this nothing saves problem remained, and I did not experience any crashes. I reinstalled TomTom and it started saving changes again, but crashes at Auto-Off came back. Somehow when TomTom is able to save changes my Treo crashes only when it goes into power saving mode. Is there a specific TomTom file that is responsible for this, and how does it correlate with my phone going into sleep mode? Any help is appreciated.