Maxed out CPU Usage, happens suddenly, no obvious cause, please help!

I've had an XServe-G5 running well for about 18 months, with anywhere from 2-5 active users at one time. The server is only running AFP, Software Update & FTP services.
For the last 2 months, without warning, the CPU usage will max out, with only a small amount of disk & lan access with it.
I've found a less than ideal solution . . . . the cpu max out seems to be linked to 1 or 2 users logged in at one time, but not always the same users, if these users disconnect then the CPU usage returns to normal. I haven't found a way to identify which user/users it is, so I disconnect them through 'Server Admin' one by one till I get a result.
This goes on up to 5 times a day. I've checked the AFP access log when the problem happens, but can't see anything there that isn't there normally, the error log has no events. When there are no users logged in, other than the local 'Admin', the problem does not occur.
We've resorted to only logging into the server when needed, but it's getting to be a major pain.
Please help!

Many things can cause this. What do you see in "top"?
One example is when you hit the "corrupt .DS_Store" bug in AFP. See afp548.com for a discussion, e.g.:
http://www.afp548.com/article.php?story=20060329213629494
See also:
http://docs.info.apple.com/article.html?artnum=301711
russ
Xserve G5 2.0 GHz 2 GB RAM Mac OS X (10.4.8) Apple Hardware RAID, ATTO UL4D, Exabyte VXA-2 1x10 1u

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