Same or similar problem here.
My videos don't seem to be in 10-20 fps, it's just the video quality that seems to have suddenly become very crappy.
I hadn't recorded anything in a few days and yesterday I played some Minecraft. I watched the video later and it was all blurry and fuzzy. I thought it was something wrong with this specific game, but now I just tried another game that I have been recording all the times before, and it also looks blurry and fuzzy as hell.
I don't know what it is, my settings are the same, even though I'm trying to play around with some of them to see if it can be improved.
EDIT: I'm going to post a log and a video of it in a few minutes.
EDIT 2: here's the stuff
Log:
https://gist.github.com/anonymous/2540927924fe1b5f8cff2b1eb5561b54 (the very last recording is of the video linked below)
Here's how it looks when it's fuzzy and blurry:
https://youtu.be/uFJLeBk4EfQ
Here's how the same gameplay looks normally:
https://www.youtube.com/watch?v=S1zBJeOR8xo&list=PLB9DaJSVSWzHejDI4gGeBamMHHK-1e9Xf