I'm having trouble with Snow Leopard server disconnecting.

I'm having trouble with Snow Leopard server disconnecting. Recently upgraded my laptops to latest MacBook Pro OSX Lion, but everything has been fine since December until now. I did just add a 2TB Drive to the set-up (OWC Mercury Elite AL-Pro) in a Daisy chain of 2 other 2TB drives and a 3TB Drive that had been working perfectly up until now. I was able to use it yesterday, but now it has gone haywire and I lose connections while working on files or saving files. Have to restart server and it works for a while, but then drops off. Could Server be corrupt?