Got to look after those buttons!
Try to remember the time difference between WA and the USA in waiting for replies.
I see your posted sleep study had no CA, so something about your therapy setting is causing this.
I find it hard to differentiate true CA from SWJ even after re-reading posts about this, but that's just me.
As suggested, see what changed at the beginning of Jan, something to do with your sleep position/hygiene/machine settings has increased your CA count.
I seldom achieve an AHI of 0, if I do it's a fluke or just meant I had a night of lighter sleep than usual. Certainly not to aim for. You will be chasing your tail for the rest of your life if you do.
As Geer1 said chopping and changing things too frequently leaves your bodily homeostatic mechanisms confused. This applies to both the machine settings and all the sleep aids you are taking, and general sleep hygiene. We have to accept some bad nights, and the occasional good one and some average ones. When changing up settings you can expect a few rough nights to start with.
Try setting your charts
in the Standard Chart Order to make it easier for us to see what is going on. Once you have them in the right order right click and select "Pin xx chart", that will keep it the way you want it next time you open OSCAR.
Looks like the week ahead will only be mid 30 degrees C so not too bad for Jan/Feb.
All the best.