Heli Rolls While Performing A Yaw

Hello, I have been mostly successful with putting my Pixhawk on a Trex500 and getting it pretty fairly dialed in. Yesterday I tried doing it a little better and for the first time noticed that when I Yaw (either direction) the 500 wants to roll. It only starts rolling after about 45-90 degrees of yaw. Of course I didn't pay attention at the time if the direction of roll was consitant with a particular yaw command. Wish I had.At one point in my fiddling with it I lost all but little control over the collective and only bairly managed to recover the Heli and land it. At that point I called it a day. Was hoping you guys might be able to help me understand what is happening and possibly how to correct the problem. Has anyone encountered the issue before?Thanks!

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