I have been using CPAP therapy for just over 6 years. Over this past weekend, I found out that I was suffering from Aerophagia. A known medical side effect of CPAP use. You can go to this link and read all about it;
https://www.sleepapnea.org/treat/cpap-th...2pINN-rBM4
If this is you and sounds familiar you can go on Nick's YouTube site and view his very good explanation and he also offers suggestions for config changes you can make to reduce the effects of this particular condition.
Note: As I post this YouTube is down: