LAN cable not connected PS5 FIX by Thoothpick
I think the problem is the ethernet cable loses its ability to transmit signals when the back of the ps5 gets really hot.
What you can do otherwise, which I did. Place/plug a toothpicker next to the lan cable to support your lan cable while its plugged in. It seems that the lan cable port is very bad!
What also might work is buy a LAN Cable which has a big strong ending. But this is a risk to take. As you need to be lucky buying the right one.
*I tried things in safe mode - which people post online, but that doesn't work
Wifi - I have no problems
LAN gives me the problems so figured it out really fast. The lan cable was in the PS4 and had never problems with my cable;)
I hope this helps for people.