The problem is Mac OS X Server. The problem is Apple's implementation of AFP and OD. I am an Apple user, stockholder, fanboy, certified system administrator and programmer with over ten years of Mac Server admin experience. So, I don't say this lightly. Apple servers are junk at the enterprise level. AFP as Apple has implemented it is just not stable with a large number of connections. Their own engineers admit to as much if you talk to them candidly. I also find OD to become corrupted and cranky periodically.