I sold my BluRay player a month or so ago and since then have been using the PS4 to watch films. Last night I tried to watch WARRIOR and even though the disc appeared to be completely clean and unscratched it would not recognise the disc! I had to connect my old school PS3 which played it with no problems. I tried playing another BluRay on the PS4, first one to hand was THE DARK NIGHT which it played. Any ideas what the problem might be?