SID- Whats the deal?

Got a NT network with 8 servers at different sites, with about 800 clients at each site. Well I keep getting promblems about losing SID. I have cahnged the sid and synchronized it with a program called NEWSID, which works most of the time, but it crashed 2 of my servers also. Question, at one of my sites, all the clients are trying to connect to one of my servers, and about every 2 or 3 seconds, I get an error in the event log that says I need to restablish the sid. I have removed it and readded it to the domain, but that didnt work. What can I do?????????????????????