That's good to hear. My letter and SD card are going off to my supplier tomorrow, and I'll add a note that the problem has been encountered by others.

I'm wondering if anyone else has had this problem, and also posting as a help to anyone who might have it in the future. It's very strange. I have central apnea that is extremely sensitive to body position, plus a bit of snoring. While on my side and on the machine, I can put up AHI's of <1.0. On my...