Why is my mask coming off in the middle of the night?

Thought I was over this, I had been having no problems for several months then Friday night I woke up to my mask off and Last night, I woke up and my machine says I only used it for 2+ hours. Looking at sleepyhead reports, there is no real reason why it would have come off the pressure wasn't too high, my AHI is almost non-existant and the leaks don't seem to be a problem especially right before it stops. Only thing I can think of is my Acid reflux was a little bad last night and possible rainout because its been unseasonably cold recently and I don't have a cpap cover as I'm using my 10ft hose now. I did wrap most of it in a rather large bath towel last night.

Last night


Friday night


Ironic thing is I didn't wake up to use the bathroom and I felt better than I usually do when I sleep with it without interruption, go figure LOL

I wonder if the weight of the bath towel tugged on the mask and either slid it off or caused you to become uncomfortable enough to pull it off in your sleep?

What do mean by off. The only way my mask is coming off is if I take it off or one of the straps or fittings break.