They got me too.
These are the last few events that earned me my dunce cap;
1. Quitting from a Deathmatch I joined without noticing a 60min time limit.
2. Shooting down a buzzard that then exploded into my friend's ride that I was in, driving & shooting from with them as passenger - killing us all.
3. (Possibly) from being kicked from random lobbies within a minute of joining for no apparent reason & before even leaving home.
4. From blowing up a tank - which I don't understand, maybe it was glitched as a garaged/insured vehicle ?
Regardless , imo all craptastic reasons to exclude me from gaming with friends.
Bad Sport lobbies are alot more fun for free roam, but being segregated from friends in any online games makes the game unplayable.