IF you bought it from a clinic, they can help you with mask fit. Their service is why you're paying the premium of using them so take advantage of it.
Also - check the humidity settings. If you have water gurgling in the machine it sounds like this is your problem. I had to turn my resmed autoset way down in summer (like 2) otherwise condensation interfered with the check valve and made a really loud noise. It should be quite quiet so something isn't right.
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