Just a total shot in the dark mind you,,,,,
For the last few days while playing I've seen random switching of the "Control Mode" from 1 to 2. I don't really have Control Mode 2 setup so my keyboard is mostly unresponsive.
I'm sure in my case that I have been fat fingering the keyboard and doing it accidentally,,,I need to swap some key mappings around apparently.
Worth a look,,,maybe.