This is in NEW OS? Do you have anything installed? I only installed xterm and ssh, also python, but that was for ROX, ROX was installed also though?

You know what, try this, maybe its what fixed mine? After crash and reboot, I ssh to n800, as user "user" run stopmaemo

If you want to capture all the output in case it crashes again, run

stopmaemo >out 2> eout

When I ran it that way I am wondering if that fixed something, though I can not imagine what? Mine definetly crashed once, I want to say maybe even twice, but after I started it the third time like this it worked consistently after that, I thought it was a fluke, I guess I should do some more testing.

Let me know what happens? If all that fails you could try moving /home/user/.kde /home/user/.kde-backup

This will remove the small amount of customization I added. Most importantly the onscreen keyboard shortcut. You can create you own, by pointing to /usr/local/bin/keyboard.sh