Its only happened to me once. I was in a room, host dashboarded (host migration failed) and then I got a 1min ban. I haven't gotten any temp bans for backing out of pre-game lobbies or leaving games (as host or non-host) yet.
Religion is the Opiate of the Masses Einhorn is Finkle, Finkle is Einhorn
I got a 1 minute probation last night, after playing for more than an hour, my party and I decided to stop playing Demolition and find a KC game. We backed out of the pre game lobby, went to find a KC and the message popped up that i had to wait a minute for quitting to often... Now i will admit to not dashboarding but turning my 360 off once mid match because i had to go. That was 2 weeks ago... Is it really that sensitive?
Oh, no other person in my party got the one minute probe...