Airsense 10 having big leaks after a year of good/normal leaks

I've been using the Airsense 10 for about 2 years now. For the first year, I rarely, if ever, had a leak rate over 24L. I've been using the Dreamwear nasal cushion mask the entire time, replacing it and the tubing, etc., every 3 or 4 months. For some reason, about 8 months ago, my leak rate shot up, and is rarely, if ever, below 24L. I was still getting the happy face, but leaks were up to 35L a night. I ordered a new mask, etc., and same thing. Thought maybe it was my new pillow, but nope - same with any pillow I tried. I was sleeping more on my side, but that's it.

Fast forward to a new sleep study about a month ago. Same mask setup at the sleep center. Stayed on my back all night, and they reported ZERO leaks. Came back home, and once again I was up around 32-34L. Then a week ago, my sleep doctor upped my pressure from a high of 10, to 15 (I'm now about 12 every night), and my leaks are off the chart - About 42L with frowny face a lot of the nights.

It doesn't make sense since all the equipment is the same and the first year I was fine. I get that the higher pressure would push it even farther, but that doesn't explain the last 8 months - or the zero leaks at the sleep center.

I'm starting to think it's my actual CPAP, even though it's only 2 years old. AHI has remained about the same - typically between 1.5-2.5, though occasionally higher or lower. (not over 5)

Any input would be great.

Thanks!

Are you using SleepyHead to track your daily results? If so, could you post a daily report screen that shows you leak rate through the night? I am wondering if it is possible that you are opening your mouth during the night and letting air escape that way? Here is a clip from near where I started with this same machine using the P10 nasal pillow mask. That second event large leak event starting just before 23:40 and ending just before midnight is probably the classic open mouth leak. It starts suddenly and ends suddenly with a relatively flat top to the event. A slowly increasing leak is more likely to be the mask slipping out of place as you put pressure on it with the pillow.

My experience for whatever it's worth: I'm a side sleeper by (strong) preference, but I notice when I do sleep on my side the leak number skyrockets, and when I wake up A) the air pressure seems really high (10 - 12), and B) the mask, although attached properly, is leaking, in part because the pressure from the machine is so high it's pushing the mask away from my face creating small leaks. If I sleep on my back I don't have the problem of leaks, although I find it uncomfortable.

Could be air escaping through your mouth or lips. Other problem is side sleeping will sometimes knock the mask. Sleeping on your back is worst for most as it is inclined to cause the throat to close and air will try to escape through the mouth or lips. Chin strap (a good one) or a cushion for the neck will help keep the mouth shut, but will not stop air escaping through the lips.