I tried a full face mask and that did not solve the problem. I tried a chin strap and my mouth opened even with the strap. I now use a mild medical tape and that takes care of the problem as long as I also use a full face mask.

Machine gets too noisy during the night
I am able to use my apap machine just fine but during the night the machine gets noisy and labored and wakes up my spouse.
My old cpap machine did this too so I wonder is there anything that can be done?