Ouch. Maybe you should be more aggressive about cleaning out the filters? Our Dyson says to clean them every 6 months or so I think, but if your house is especially dirty (say because the dogs track in a lot of dirt and shed) you should do it more often.

If you have not done it in awhile it can be surprising just how much better at picking up dirt it will become after a good cleaning. Because the filters are trying to get down to 2.5ppm they clog easily.