For X crashes/lockups, we need either detailed steps to reproduce the issue or a full backtrace. I'm guessing since you described the crashes as random, the former may be hard to do, however since you can ssh into the machine after a lockup, the latter should be doable. Directions for getting a backtrace can be found from the troubleshooting section of http://wiki.ubuntu.com/X.
Hi tawmas,
For X crashes/lockups, we need either detailed steps to reproduce the issue or a full backtrace. I'm guessing since you described the crashes as random, the former may be hard to do, however since you can ssh into the machine after a lockup, the latter should be doable. Directions for getting a backtrace can be found from the troubleshooting section of http:// wiki.ubuntu. com/X.