How to know when CPAP machine is nearing the end?

[onthefreeway]

I've had my Resmed 9 Autoset for 7+ years; it has more than 20,000 hours on it but it's humming along beautifully, I have no issues with it.
To be on the safe side, before COVID struck, I did get a Resmed 10 AirSense Autoset just in case my old one went south and I couldn't get a new one, but I haven't used it yet (not a fan of the wi-fi aspect). So my question is, how do most CPAPs give up the ghost? Do you turn it on and it's dead? Does it start to gurgle, or hum, or...? I'm just trying to figure out what to expect. Thanks.

[LSAT]

There is no wi fi on the Airsense 10...it's cellular. If you didn't purchase it with insurance, no one is monitoring you. If you are worried, turn off the cellular by going to airplane mode. At a certain point, your machine may give you a message saying you have exceeded the expected life of the machine, or it may become unreliable as far as data. 20,000 hours is getting near the end.