Hi,
The past two nights I"ve noticed that as the night progresses, with 2 different masks, I get a noisy clunking when I inhale on both my quattro and my liberty. It seems like it might? be the asphyxia valve and accumulated moisture, but it's noisy and impedes normal breathing at a certain point. Sounds like a pingpong ball bouncing around. I do have the humidity cranked up to reduce my sore nose. Any ideas? It's really annoying. The fact that it happens with two different masks tells me it's not the masks per se????

