E’s answer is not a good one, just happened to me, usually when you disconnect you can come back, now the “you are off-line” was for a second, no count down that I could see, when I tried to go back I was kicked out of the game, and -11 ELO, no early warning that I am off line, this is a bug, happens all the time, that is why ELO is ridiculous and frustrating, takes away all the pleasure of the game, TAkE it off!! Or hide it in a way that one would have to look for it independently of the game to find it. It creates unnecessary stress, seriously. I enjoyed Catan much more without it. I want my money back, what I payed is the only reason I don’t delete the app after I have gone down 50 points from ELO calculations and kicks off...
depict the style of a total idiot, 
lol.