mouth is filling up with air

I've been sleeping with a CPAP machine every night for 15 years . I have never had problems. The last few mouths I have had noticed that my mouth seems to fill up with air and is then forced out of my mouth . I am not a mouth breather and have never had this problem . This results in episodes of course . My pressure is set at 10 . It's as if my throat is closing and the air isn't been forced down my throat but forced out of my mouth . I even have tried propping myself up with pillows. 6 months ago I had a hip replacement and it resulted in a shower of many large pulmonary embolisms which landed me in the hospital for a few days. My pulse ox numbers are always 92 or above while laying down . Occasionally I had a 88 reading with rapid heart rate which would return to normal after a few minutes . Anyone have this problem or any ideas as to what is happening ?

I have always had this issue, and tried wearing a full face mask, but could not tolerate it. I resorted to trying different chin straps, and they worked to some degree. The Breathewear Halo seemed to be the best of what I have tried. I now use mouth taping and find that to be more comfortable. Some people report that they can control it by keeping their tongue at the top of their mouth right behind their top teeth. I find that does work until I fall asleep, and then my tongue does what it wants to do, not what I want it to do!

Thanks for info . I also seem to snore now !!! LOL !

First night with chin strap . Fantastic ..8 hours non-stop and NO episodes !!!! Thanks again Sierra !!!!

Good to hear.

That's great that a chin strap worked for the OP! But I have a question... my problem is not necessarily with my chin falling, but with my tongue relaxing. That can (and does) happen even when my mouth is closed (tried taping, which I didn't like, but tried it anyway...). The air starts going into the mouth, and if my mouth is closed, it just inflated my cheeks (chipmunk cheeks). So, a strap doesn't help, nor does taping. What does one do it this case? (If you're going to say, "try a full face mask," well, I already did. The problem there is that it totally dries out my mouth, which can cause serious dental problems, so that's not a viable solution either...).

I'm asking in this thread and not starting my own because the title is good, and I want to help others who find it to get this information, too, that the OP had luck with a chin strap, but that that doesn't solve it for some of us. So, any suggestions?....