Game Mechanics: Ducking while playing bard aoe songs

[Mystro]

I had this happen numerious times which ended up in deaths.. I would be "aoe" kiting mobs in circles and all of a sudden my character will duck or "crouch" During my circle rotations (I never hit "c", just random). There is no objects, cliffs, hills, etc in sight, he will just randomly duck, and anyone who aoe kites will know your basically dead if this happens.

The following zones are where I was during this time: City Of Mist, Overthere, Dreadlands, Timerious Deep.

Thanks,