SSH Session Hangs on opensuse 11.1

Ive enabled ssh with x forwarding on a desktop pc running 11.1
I can login to SSH and do whatever I need to do. I had been noticing recently a few times when my desktop pc had fully locked up hard.
Recently I was in ssh and tried to end the session cleanly from putty, but it appeared hung so I closed putty anyway. A few secs later the desktop pc hung.
Im going to try shh from 11.1 on the same client machine to if i can repeat.

Any ideas on this one?