Sierra

From what I can see this F40 mask is similar to the F30i, except it seems to be designed to be much more flexible. It may help to prevent the mask from being dislodged from your face.

I don't have the A11 model, but the humidifier looks identical to the A10. The humidifier is not really a high tech device. All it does is divert air from the CPAP over the top of the water in the reservoir, while the reservoir is being heated. Some things to check is how much water does it use. My experience with a 9 hour sleep almost all of the water is consumed. That may depend on how dry the environment is in your home. Currently we are at about 30% humidity, so that is kind of dry and will need more water. When the machine has been in operation for a while, shut it off and take the water reservoir out. Feel the stainless steel bottom of the reservoir. It should be quite warm. If you are not using a lot of water and the bottom of the reservoir is not warm to hot, there must be a problem with the heater in the machine.

Another thing to try is the warmup feature. The idea is to select it from the menu at least 15 minutes before going to bed. It should blow a small amount of air through the hose and mask and at the same time warm up the water in the reservoir. It will indicate when it is warm on the display. Again check the bottom of the reservoir to see if it is warm after 15-20 minutes. If the heater is defective there will be no warmup.

I have been suspicious of my hose too. It never feels warm. I am on my second hose because the mask end of it got discolored and soft. It would no longer hold the mask hose reliably. It almost seemed as if it was getting overheated although I never felt it even warm. The new hose restored the fit, but it has never felt warm either. When we camp in our trailer off grid I turn off the humidifier and heated hose to save power. Most of the power used by the CPAP is for the hose and humidifier. We charge the batteries during the day with solar panels and run two CPAPs at night. I still put water in the humidifier but essentially none gets used. On one occasion when it was fairly cool (we don't run our furnace when off grid) I did get some rainout even though the humidifier was turned off. The tube was exposed to the cool air and was looped down behind my pillow and collected water. Very annoying as I had to get up in the middle of the night to drain the hose. I routed the hose under the pillow instead of behind it and the rainout at least to the point of not gurgling stopped. The point is that you can get rainout even when the humidifier and hose are turned off. At home with the heated hose on and humidifier on I never get rainout.

FWIW I have my machine on Auto with humidity set at 4 which I believe it defaults to.

I don't believe there is anything special about the A11 humidifier. You may just have a defective machine. If you still have one of your old machines, perhaps get a return approval and send this one and the hose back to ResMed for repair or replacement. We had some issues with my wife's S9 machine's DC to DC power supply. It would trip out when using it in our trailer. They sent two replacements before I gave up on them. The overload design on the power supply for this machine was obviously defective. It could not handle the extra power the heated hose and humidifier took. The problem was eventually solved when she got the A10 machine. For that one I got a DC to DC power supply off Amazon that was about 1/3 the price of the ResMed one and works just fine.

I found this video review that seems quite complete. It compares the F40 to the F30i and a couple of other masks. As a caution the mask uses magnetic clasps which should not be used if you have a pacemaker.

ResMed F40 Full Face Mask Review

I noticed that ResMed has released a new full face minimalist mask in the US. It is claimed to be more flexible in changing sleep positions while still maintaining a seal to the face. It might be worth a try. Manufacturers are always releasing new masks with claims that they are the best things since sliced bread. But, one never knows until they try it. I believe CPAP.com has a money back refund on masks if they do not work for you. Or, better still your insurance may pay for it...

https://sleepreviewmag.com/sleep-treatments/therapy-devices/cpap-pap-devices/resmed-launches-compact-full-face-cpap-mask/

A chin strap should not be required with a full face mask that covers the mouth and nose. Mouth taping also should not be required with a full face mask, although there are some that claim there are other benefits to breathing through your nose only.

I suspect the blank period was when the mask came off and the machine stopped automatically, and then started again when the mask was moved back in place.

On pressure you could try moving the minimum up to 12 and the maximum up to 14. That would narrow the band between min and max to move it closer to a fixed pressure setting.

Most people have more obstructive apnea when sleeping on their back, and it is good to avoid it if you can. Some go to the extreme of sewing a tennis ball into the back of their PJ's to make them avoid sleeping on their back.

That is still to the right of the area of interest with the three CA events. Just need to use the left arrow on the keyboard to move the window to the left so it covers them. See the area circled in red.

That is close. Can you shift the zoom window to the left to capture the beginning of the green CSR area so the three CA (magenta color) events are included.

Ok, it is probably best to see another night or two, hopefully with less leakage, before making any more adjustments. The one section in the middle of the night looks pretty good, but I wonder if you were actually asleep then?

Could you go back to Saturday March 23, and specifically to the start of the sleep about 23:00. There is a section highlighted in green indicating CSR. If you left click on that area repeatedly the scale will zoom in. You can fine tune the zoomed section with the up down and sideways arrow keys. The idea would be to get a highly zoomed in section that includes the three CA events that occurred during the CSR. If you could do a screenshot and post it, I would be interested to see what it looks like. That may be a clue as to what the nature of the CA events are actually about. Here is an example of a night when I was flagged for CSR. I have some theories in what is causing it, but need to see the nature of what you are having to be sure.

No need to go to all that trouble. Just use the orange Write a Reply button to start a new full width window. You can find it on the top right of the page or at least sometimes on the bottom left.

On doing the graphic I think it helps to go to a full page view with Oscar to do the F12 screen capture. After that no need to leave it at full page. Just close it and drag it from the folder where you saved it to.