On my original PS4 controller (got another one when I upgraded to PS4 Pro), the up, down, left and right buttons just one day decided they didn't want to work anymore. I've tried resetting the controller, a number of times, with the same result, which leads me to believe it's not the signal to the PS4 but rather something within the controller itself. I'm not too keen on opening it up and it could not be the buttons themselves anyway but maybe a cable that goes from that area to the rest of the controller? Does anyone have any DIY advice before I break down and pay a bench fee?