My controllers are intermittently shifting position. This problem appears to be getting progressively worse and more frequent. I have not changed anything about my environment and it happens no matter what the lighting/surrounding environment is like. I have tried using brand new 1.5v batteries, the 4 outer lenses are clean and do not appear to have any scratches on them.
You can see the problem occur at between 0:08-0:11 second mark in this video, notice the controllers shift down by a few inches, then revert back to the correct position: