Noticed a problem with my S7 not having as much suction as it did a while ago. Had replaced the filter cartridge recently. Called support. Tech directed to look with a flashlight into the little duct on the side of the hole where the dust bin goes, where the air comes out of the dust bin and goes out through the vacuum. There is a small duct with a screen down inside there that you can just make out. Mine was full of dust and fuzz. I sprayed compressed air into the spot on the outside of the vacuum where the exhaust air comes out and the blew all the dust and fuzz out of the screen inside the exhaust port. Problem solved! Hope this helps someone else!