We were fighting Oryx. Four flawless rounds, at the very end after killing the 4th Ogre, 3 of our fireteam members got the same problem: Basically, your gun gets stuck to an idle position, it skips animations while shooting and your character slides off sideways and is out of your control. I imagine this is a synchronization problem. LET IT BE KNOWN. We would have killed him at that run, alas, 15 minutes were lost in the dark corners of time.