Have been running the G0441 dust collector for about 3 1/2 years and it is working well. Recently, the brush system for the hepa filter has been getting stuck to the point that I have to pull the filter out and spend a few hours cleaning it. As a result, we have been religious about sweeping the filter immediately following every use, regardless of how short, as well as making sure to empty the chip collection canister well before it is full. I am wondering if something else has changed in the system that may be causing the brush system to get stuck. You can literally hang on the cable (admittedly, I only weigh about 130 pounds) and it will not move. Any thoughts?