Valve Index Controller Failure, internal gyro

While playing any game, the left hand controller will loose its tracking with certain motions and fly off into the distance or disappear. If it is stuck, a gentle shake will restore it. I can only assume its the gyro sensors as the lighthouses are perfect with everything else. The rattle you hear is the hand strap button, it does not matter if they are tight or not, to trigger the issue. These controllers are fresh from RMA and AS BRAND NEW CONDITION.