OK here is how you can help with this tricky issue.
1) Graphic setting.
2) System specification.
3) ISP provider.
4) Router make.
5) What firewall ports you have open for Xsyon.
6) What you are doing when you disconnect. (zone crossing etc).
7) Are you running multiple account, multiple accounts on he same computer or different computers? Do they disconnect while running both accounts and/or running a single account?
8) Any other info you can think of.