There is a bug that occurs when someone (not you or your freinds) fails to accept the AFK check. Then, when you are put back into que the que never pops. Que can pop in like 30 seconds, AFK check fails, you go back into que and then wait 6,7, 8+ minutes and it never pops. I've waited up to 18 minutes before.
Had this happen, probably 6 or 7 times I'd say over the last 2-3 weeks. Its really rough when playing on a smurf since que times are long anyway. Sometimes it's hard to tell if you're bugged. Dropping out and remaking the lobby will fix it, but it'd be nice to get a patch on that.