Your TV is new and still under warranty. Call them to fix it. It will not take long. I have a Panny 65ST30 that had a buzzing issue. They knew the problem right away and came to my house with a screw kit. No more buzzing.
I am having issues with my 2313 HDMI video out...white lines and flashes...also my sound clips from time to time at normal volumes...wife is not happy!