Ps4 Slim lan defective?

My Ps4 should be 2 years old. Bought them with Cod Bo3. I played warezone with my colleagues and everything went perfectly. Suddenly it started to hang in the game. I ran, suddenly it made a 10m jump forward and back again and to the right and suddenly stood in front of a wall. And that kept coming back. I then saw that my Lankabel was broken. Bought a new one and then it worked again. After a month or two the same problem came back. Then bought a new one (that was yesterday) and nothing has changed after that. It can't be because of the internet because it works for my brother (room next door). So I ask myself whether it's the Playstation, but if so, what? Is the Lan connection deffekt or something else? Or is it not at all due to the hardware?

That sounds more like a big lag than a hardware error. It is possible that your internet is too bad, especially if you are playing at the same time or the router is closer to your brother's room

It is not due to the router because it makes no difference how long the LAN cable is. We also have an 800 line. So almost fiberglass.