Thank you very much for your post, Sierra. It's possible that the current from the wall socket was not conducting efficiently. That being said, I replaced the machine with another of the same model and have had no incidents since then. My pressure is 12 cm.
If anyone from ResMed wants the machine and they send me a prepaid shipping box, they can have it.
Thank you for all of your replies. I was feeling more and more tired so much so that I went to bed at 8:15 PM. At about 8:50 (prior to falling asleep), the pressure dropped significantly so much that I was trying to suck air in through my nose. I don't use the ramp feature. I'm using the same model machine now but not that particular one as I'm scared to.
I did not turn configure it to not shut off, it just broke. The auto on feature did still work. The big thing is that it started to randomly decrease the pressure by a significant amount while I was sleeping which caused me to wake up with my heart pounding and soaked in sweat.
I just wanted to warn people to watch out if their AirSense 10 began to behave in a similar manner.
A couple of months ago, my Resmed AirSense 10 stopped automatically shutting off when I removed the nasal pillow mask. No biggie - it still turned on automatically when I put the mask on my nose. However, a few days later I woke up sucking in air as hard as I could with my heart hammering in my chest. I assumed that my nostrils had plugged up as can sometimes happen and went back to sleep.
I was getting more and more tired and went to bed at 8:15 one night. Within 45 minutes and before I fell asleep, my CPAP cut air pressure down to maybe half (5 or 6) maybe less. Fortunately I had a spare and switched to that.
I tried unsuccessfully to contact Resmed about this. I feel I have to tell someone.
Beware if your Resmed AirSense 10 stops automatically shutting off when you remove the mask.