I have a good guess that many have been kicked out of a 5man instance by some guild runs, it doesnt matter whether your right or wrong, if the guildie acts like a idiot, or keeps making mistakes they always blame the none guild players, if you just look at them wrong they kick you for that.
Today I've done 4 runs and out of 2 of them I got kicked becouse I merely sugested the players from the that guild run what to do, and after the boss was dead I got kicked out of the group and I was toping recount with damage/dps plus I was doing my job of interupting "Pain and Suffering" in SFK(1st boss). Oh not to mention the 40 mins wait time!
Seriously wahts the problem with people and the way they act, worst part is that type of behaviour is mostely found in guild runs......
P.S. This isnt a QQ post just hoping that Blizzard notices this prob and actualy does something about it.