Sorry to hear that - some of these issues can cause you to pull your hair out, I know.
But please, give us some info on what you installed - did you install any other codecs (or "just" LAV)? Which GPU do you use & which drivers? It even might be HW related if it pops up so readily again. Any issues putting load on the system, esp. Gfx load?
But please, give us some info on what you installed - did you install any other codecs (or "just" LAV)? Which GPU do you use & which drivers? It even might be HW related if it pops up so readily again. Any issues putting load on the system, esp. Gfx load?