I noticed that some of my settings were changed. I would find the Control Center and look around in the Sound section. I still have one that I have to change everytime I log in. It won't save it to default even though I told it too.
I did change mine form auto detect to ALSA. That seemed to help a whole lot. Don't forget to hit apply and you may have to logout and back in to make them reset. I usually hit ctrl alt bksp just for good measure. Beats rebooting though.
Another glitch I guess. It happens.
Later