Planet M.U.L.E.

I was playing a training game and while my mates were doing their movements I opened facebook a moment and minimized the game. Then I got disconnected from the game. Is that supposed to happen? I didn't leave the game or anything, just opened chrome a moment.
Thanks

Shouldn't be an issue, possible you were kicked? or just randomly disconnected by a network glitch, or if your computer is struggling with keeping up with mule to begin with, maybe it just couldn't keep in close enough sync to keep linked while doing another task.