EdFJr, I'm going out on a limb here.
I've been on my ASV for about 4-1/2 years, so our machines are pretty close to the same vintage.
My ResMed AirCurve 10 ASV made a few loud, startling pops a few years ago. Maybe only 2 to 4 times. It hasn't done it since. I think it was my humidifier tank maybe not being snapped closed correctly or seated properly in the machine itself. Or maybe being closed overly tight. And I think the sudden higher inspiratory pressure popped the humidifier tank back to its normal snapped-closed position or reseated the tank in the machine (the little spiky retaining catch on top of the tank). As I recall, I actually felt the pop abruptly in my mask when this happened. This is all speculation since it only happened a few times.
I might suggest trying a blank side cover in place of the humidifier for several nights and see if the popping persists or goes away. Do a search on "AirSense 10 Side Cover" PN 37335. They seem to be around $15 to $20 at many online stores, or check the
CPAP Supplier List on AB.
You might also inspect the silicone outlet from the air pump that feeds into the humidifier. Also, the output side of the tank needs to seat properly onto the silicone seal that ports out the rear of the machine. This part is removable and is a replaceable part. This is called the "Air Outlet Adapter" PN 37310. Good to have a spare on hand and also $15-ish or so.
I hope this helps track down the culprit and is an easy fix. Otherwise you may be looking at the end of life of your ASV and hopefully be able to convince your DME to replace it.
Last ditch effort, you could buy your wife a Sony WH-1000XM5 Wireless Noise Cancelling Headphone for only $400. And you could use it during the daytime. OK, maybe not the best solution.
