I've tried to do just like you told and I have some example videos but I can't link to them as I'm new member (joined 2008, never written anything before
Couple a days I did some filming outside and I had to start recording by covering the lens with my finger every time to get normal fps. This way it works fine and I get good quality.
I don't know if it has something to do with that there's really bright outside during day because all the snow here but I can also replicate the problem by pointing camera to my monitor.
This is new issue for me too as it was working fine untill now.
btw. It seems to work fine if I use VGA quality.
I just hope I don't have to reset my phone.