FS & SB Dissconecting From FS Session

For a while now i have been having the same annoying problem.FS2k2 & SB will connect perfectly and conenct to the network fine.After a period of time i get the following message in FS:"BAW982 (MyCallsign) Has Left The Session"At this time all other players in my multiplayer session will leave and thecontroller will loose me from the scope.To be able to see other players again i have to follow this procedure:Close SBDissconnect Multiplayer from FSMake a new session in FSReconnect SBThis can happen 2-3 times in 30mins.I have reinstalled both FS & SB and the problem still remains. Im using acomputer which isnt directly linked to the internet but is a client on ahome-network.Help Appreciated ThanksJoe