Syncing My Tungsten T5


I have a Powerbook G4 running OS 10.2.8. I've just upgraded to ical 1.5 and isync 1.5. I finally got my Tungsten T5 to begin syncing with iCal and Addressbook, but in the middle of it, it crashes the whole computer. A crash that is VERY difficult to recover from.
Why is this happening? What can I do to fix it?