Honestly, it's a somewhat difficult problem to explain, but I'll try.
This PS4 turns on and works without issues, but after playing a game for a while (about 20-30 minutes), the screen freezes. If you listen closely, you can even hear a "click" coming from the hard drive. I have to force it to shut down and then turn it back on, and when I do that, the console starts up normally, as if it only had a problem shutting down improperly.
Regarding the textures that appear in the video, on this PS4, when you start playing, the textures load very slowly. Before you say it could be the game, well, it is partly true, but I have another PS4 (the original "fat" model) with the same game, and the textures load on time; this issue doesn't occur.
I can tell you now that the problem isn't the hard drive, since I tried three different hard drives with 100% life remaining, and the problem persists. It's worth noting that I received error code CE-34335-8 three times, but it didn't happen again after turning the computer off and on. I disassembled the computer and checked the voltage regulator IC that supplies 5V to the hard drive, and it was receiving power.
Honestly, I didn't see any hardware problems, but I suspect the issue lies with the HDD's voltage regulator IC, the southbridge, or the RAM, coinciding with the texture problem. But I don't know where to begin.