I searched and found no suggestions other than the obvious.
Firmware 1.0.18.0
The air purifier is 3 feet from the router.
It usually goes offline every couple days and the WiFi LED flashes.
The signal strength shows a full 3 bars when it is online.
I add it as new and everything is fine until it isn’t.
Any ideas? I can hear the fan speed up and slow down, and the purifier responds to button presses on the purifier.