Yes this has happened twice for no reason. Yesterday was during a session with Larry David! Luckily I checked and didn't lose anything, but yes, I'd like to find out why it does this. In my case I didn't do any re-arming of tracks or anything like that. Picky with the SD cards maybe?
Please post a response if anyone figures this one out.
PS. They have a 1.10 version now and it mentions something about fixing a noise bug, so maybe that'll do the trick.