Hi ladies, I just got done vacuuming my house, and as I was starting I noticed that it didn't have very much suction. I opened up the vacuum (bagless) to see if there was anything blocking the suction, and the HEPA filter was full. Full meaning: all the little slots were filled with dust & dirt. We just got this vacuum and haven't used it that much, but I'm wondering how often I should clean the HEPA filter? Is it normal that it gets clogged that quickly?? ...or do we just have a dusty house? Help? Thanks!