Could it be scale as from not using distilled water? I have a very tiny amount of something whitish in mine that I see when I pull out the water chamber..I do use distilled water 100% of the time but I wash it in regular water and am wondering if putting it back into the machine before it's dry coul...

Thank you everyone for your thoughts. I know this has happened at least a couple other times and the occurrences really space themselves out. I've been on therapy for 11 months. And according to MyAir, I had a gold star for the night in the air leak category, so we can rule that out. sptrout, oh ho...