I've owned two pairs of X12's and never had this problem. I'm going to assume that you've disconnected and reconnected the cord, so try out all of your connections. On the TV, xbox, volume control, headset, everything. If that doesn't work, break out the masking tape and make that sonofabitch stay still.
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Haha you are right about me having to reconnect the cord. I will try all the cables ASAP, but if anyone else has suggestions keep 'em comin!