Ethernet doesn't have a valid IP configuration, but wifi works

Hello,

I know there are already a lot of posts about it, but nothing seems to work.

It tells me "Unidentified Network" and when I run the diagnose, it tells me "Ethernet doesn't have a valid IP configuration.

My drivers are good, I disabled and enabled it about 15 times, but nothing works.

Note that my router is on the bottom floor, I am on the second floor with my ethernet cable plugged in to a TP-Link TL-PA211. Everything worked fine for a few years, but then, a few months ago, I started having these problems. It would generally work after a few minutes, but it's now been 12 hours and still nothing is working. My wifi works fine, but as I am not at the same floor as the router it is really unstable... 

Here's my ipconfing :

Windows IP Configuration

Wireless LAN adapter Local Area Connection* 4:

   Media State . . . . . . . . . . . : Media disconnected

   Connection-specific DNS Suffix  . :

Ethernet adapter Ethernet:

   Connection-specific DNS Suffix  . :

   Link-local IPv6 Address . . . . . : fe80::2d53:64af:5a7a:4b1a%12

   Autoconfiguration IPv4 Address. . : 169.254.75.26

   Subnet Mask . . . . . . . . . . . : 255.255.0.0

   Default Gateway . . . . . . . . . :

Wireless LAN adapter Wi-Fi:

   Connection-specific DNS Suffix  . :

   Link-local IPv6 Address . . . . . : fe80::786a:6c1d:2b4e:6ae0%7

   IPv4 Address. . . . . . . . . . . : 192.168.1.7

   Subnet Mask . . . . . . . . . . . : 255.255.255.0

   Default Gateway . . . . . . . . . : 192.168.1.1

Ethernet adapter Bluetooth Network Connection:

   Media State . . . . . . . . . . . : Media disconnected

   Connection-specific DNS Suffix  . :

Tunnel adapter Teredo Tunneling Pseudo-Interface:

   Media State . . . . . . . . . . . : Media disconnected

   Connection-specific DNS Suffix  . :

Thanks for the help !