Dont know about you Allies, but almost everyone I know that have a launch PS4 has this annoying issue.
My PS4 from time to time ejects the disc by itself mid-gameplay or even when its powered down.
At first it was rare enough that it didnt bother. Like once every 2-3 months.
Then it became so frequent that I decided to abandon physical media altogether.
I tried all kinds of fixes like:
-Rebuild PS4 database
-Power down, plug off, wait 3min, power on.
-The official solution from playstation support: tight the eject screw on the HDD bay side. Sony even made an official video about it.
All of those were temporary fixes, the problem returned after a few hours/days.
The main issue is(or seems to be) static electricity triggering the capacitive eject button.
Its a major design flaw that Sony wont comment about.
But this definitive fix is simple enough and requires no hardware expertise,
all you need is to take the botton cover out and put some tape on the eject button sensor on the motherboard.
This did it for me and I feel like I need to spread the word since I know it annoys A LOT of people out there.
The eject button is disabled by it, but most people eject discs using the PS4 interface anyways.
All kudos goes to David Rutledge from this video:
Youtube Video