I had this problem about three months ago. The fix I found was to hold the power button until it beeps twice. At this point, the PS 4 turns off. Then unplug the power cord. Wait a few minutes, insert the power cord and start playing. It worked until the next time I turned the game on after turning it off.
I got into the habit of ejecting the disc before turning the PS 4 off and then turning the Ps 4 on and signing in before inserting the disc. I haven't had the problem since.
I had this problem about three months ago. The fix I found was to hold the power button until it beeps twice. At this point, the PS 4 turns off. Then unplug the power cord. Wait a few minutes, insert the power cord and start playing. It worked until the next time I turned the game on after turning it off.
I got into the habit of ejecting the disc before turning the PS 4 off and then turning the Ps 4 on and signing in before inserting the disc. I haven't had the problem since.