I have changed ethernet cable 3 times every time with tp link 5e Edit: The main problem comes after a while post boot, it starts at 1000 then drops to 100 showing identifying and then settles at 10...

I tried to follow the solution on https://community.tp-link.com/en/home/forum/topic/223040 But I cannot find any negotiation option in LAN settings, there is only one on the Internet setting and...