So the assumption here is that the CSS is not core dumping to begin with ?
With that said, there is not too much you can do. When you say lock up, do you still have telnet, or do you lose everything like telnet, console, mgt port access ?
As Pete mentioned, you should look for any core files that may have been saved. Also, the CSS logs to disk instead of to memory like a router would, so logs are usually preserved after crashes, reboots etc. You could increase your logging detail, and review the sys and trap logs after the event takes place.
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