Users not logging out properly

Hello All, Some strange issues have cropped up on our Xserve (1Gig RAM, X.2.3). After a few hours, AppleShare acts up to the point where it claims users are logged in, refuses to disconnect idle users. We're using X.2.3 clients to authenticate to the Xserve and pull home folders from it; there seem to be about 10 guest connections per machine (as many as we have automount share points) but even when the only operating client is shut off, Server Status just sits there saying they're idle and have not disconected. Oh yeah, and every so often I get the message MMap Chainhead is NULL, right before everything goes south. Any ideas? I am pulling my hair out as I have to restart AFP every few ours! --John johngibbs@removeme.tasis.com