Aside from COVID variants Delta and Omicron, one of the biggest events of 2021 in the world of OSA was the recall by Philips of the Respironics DreamStation I and DreamStation Go CPAP, APAP and BPAP units, among a number of other therapeutic devices.
The recall focuses on the potential of the noise-dampening foam in the units breaking down and allowing harmful particulates to enter the airstream and ultimately into your lungs.
If you have any Philips brand unit, visit the Philips recall site, here, to see if the recall applies to your appliance and register your device for service or replacement.
Talk to your medical provider about continuing therapy on these devices and whether you should pause treatment or use the machine with some modifications. – Matt Lindler