I have seven archive servers, one primary and six remote. replication between has been good. However i have one location that the archive service appears to hang for a lack of better term. We are using the Windows login for authentication.

once a week at this location, time and day are random, i will get a call from the users that they cannot login. the server is up as well as the archive service - but in order for these users to be able to login i have to restart the archive service.

Servers are running Server 2008 64bit edition with 2009 Sp0 EPDM.

Any thoughts to why authentication fails randomly on this box only?