We had the same issue with our V11. Fine dust was getting in the area between the plastic ribs and the collar of the lower portion (near the electrical contacts) causing the plastic parts to gall, which closed tolerances and caused the jamb. My wife did not have the strength to separate the canister. I was able to get it apart, clean the area, and lightly sand the galled parts. This allowed it to work smoothly without jamming for about one or two tries and then the fine dust was back to jamming it again. We returned the Dyson to Costco. This is an unfortunate design flaw because the vacuum is otherwise awesome.