We are terribly sorry to hear what you have had.
After changing the filters, for AirMax8L, please press the sleep button for 3s to turn off the filter reset light; for AirMax4s, press the reset light for 3s to turn off it.
Could you please send a video about your issue to our email@example.com so that our tech team can further investigate and offer a quick solution to you?
You are our valued customer. Please rest assure that we will try our best to offer help.
Okaysou Support Team