My ps4 regularly either won't eject discs or won't accept them. I'm quite sure its something to do with the manual eject screw. When my ps4 doesn't suck in the disc I put it in the drive then turn the manual eject screw the opposite way until it's all the way in. If the manual eject screw is a bit tight then keep on turning until you feel it go loose then tighten again then go back a slight bit to where it feels slightly loose then power on your ps4, it should start reading now, once mine didn't so what I did was carried on turning the manual eject screw the opposite way and eventually I heard a click, I stopped and powered on the ps4 and it started to read the disc again. Hope this helps!