I have used a cpap machine for 10 years with no problems to speak of. But suddenly I'm having trouble with my mask occasionally thumping during the night. it's a Comfort Select which has the little flap inside the main cushion. My guess is that something is causing the flap to "pop" like a flag in the wind, but I have no idea how to stop it. I use a heated humidifier. Has anybody else had this type of noise? Does anybody have any ideas how to eliminate it? I would appreciate any suggestions!


).After awhile the silicon and other soft parts start breaking down. With some masks, you can tell they need to be replaced when you have to start tightening the straps more to keep it from leaking. Your notification must be your thumper. Save parts off the old one that are worth saving so that if a part breaks, you'll have a spare.