I had turned them up a little from 5mbs to 10mbs or something similar. But when the mic stopped working I went back to default. I didn't use any commands on recording settings....actually....I think once I turned on developer mode the mic stopped working. And it only works if I do a "boot" in the safe menu. But I lose mic again once I enable developers mode.....I think.
I guess my best workaround is using an external mic when making gaming videos. But it always is disappointing when you have a brand new toy and something doesn't work.