@MortalCompote Ethernet being stable means not even a 2degrees issue so the TDR won’t have a bar of it... You’ve simply got WiFi issues as expected. Lock the WiFi channels (Pick a non DFS channel for 5ghz and 1,6 or 11 for 2.4ghz) - if you’ve currently got 2.4GHz fixed on any other channels then change this else your Neighbors will hate you.

Also not to beat a dead horse but do you seriously think WiFi, where there are so many variables that can affect WiFi performance including the device you’re using is your providers responsibility?

Speaking of locking as the original 2degrees problem is resolved I’m locking this. There are hundreds of threads on WiFi issues on here if you need any more information.