I hate myself when I get optimistic
Beware of things that change by themselves. Do you use the computer for anything else, particularly anything with its own sound services? Skype does not Play Well With Others to borrow a report-card phrase.
Do you let the computer do automatic updates? How full is the hard drive? That last one regularly burns the video people.
"I've been cranking out long form videos for a month and now, suddenly, for no reason, and out of the blue, with absolutely no warning, the computer is going wacko."
Hows 'bout we take about 200GB of video production off the machine, optimize the drive and try it again?