actually a warning was given...............in the corner but.......i kow how it feels........to not win in a game you would have certaaily won
Who shut down the server w/o posting a warning?

I guess if the server really shut down and it was not due to maintenance, it is rather impossible to foresee that and issue warnings to players currently on that server.
Advance warnings like that only occur with scheduled maintenance. It's more or less impossible to predict a server crashing. Although I don't know which of the two is true in your case.
I had a 10 minute game aborted with "server shutdown" and there was no pre-warning given to wrap up the games.