my surface pro is popping and crackling when being used in portrait mode( only affects it when USB is down) sounds like there is air in the liquid cooler. does anyone else have this? there is only one other person I can find online with this same issue. Hardware failure? edit: getting worse. flipping the sp4 removes the sound, but as soon as the USB side is facing the ground it sounds like a loud grumble belly. Sounds almost like a pumps broken and the water is having trouble circulating. I will be calling Microsoft tomorrow.