One of my customers has one of these and it's having an issue with the top boob getting stuck in the down position. I've read through all the posts concerning the boom, but none described what is happening with this one. Every now and then it gets stuck down and when we look at it one of the belts that move it will have a LOT of slack in it. It's as if the wheel that takes up the belt turned on the shaft. We will fool with it to get both belts the same tension and it works fine for a day or a week, and then the same thing. Any thoughts?