My electrolux oxygen cannister has

Question

My electrolux oxygen cannister has the "bag change" light on when there is a new bag. The light stays on when the suction power is high (to pick up small particles) and it won't pick up, but the ight goes off when the suction power is low (to pick up big objects). I changed the hepa filter, cleaned the motor filter and changed bags, but all that didn't help.