I have a Samsung UE40EH6030 3D TV in Game mode. I got XBOX360S console with 2 guitars, drums, keyboard. I have 8 other XBOXes in the vicinity. Problem is this: in the beginning there is no offset, latency is 0, etc. As the evening progresses, the offset periodically changes to worse. In the end the offset is more than the max 300 ms allowed by calibration. The manual calibration shows sometimes latencies in the - and sometimes in the +. This influences the drums worst as the players cant keep to the rhythm. Anyone else have this issue? And any idea what to do?