Are you sure it is getting to the filters? If it is only swirling at the pipe going into the debris container, that doesn't necessarily mean it is being sucked up into the center tube of the cyclone to get to the filters. Not sure how to check for that. If it is getting to the filters, that would lead me to believe that there is a leak somewhere that you haven't been able to detect, as that is the only cause I've ever heard reported that could suck the debris out of the container and into the filters. Doesn't mean I've heard all of the possibilities though. Keep on Oneida. Show them that there are others out there with this problem. Hopefully they will be able to help you diagnose and fix whatever is going on. Jim.
Home of Irish Setter Rescue of North Texas
When Irish Eyes are smiling, they're usually up to something!!
At a minimum, I'm Pentatoxic...but most likely, I'm a Pentaholic. There seems to be no known cure. Pentatonix, winners of The Sing Off, season 3