I can connect to internet through it just fine, but after a while it just shuts off, can't use it anymore unless I reset the ethernet adapter, especially when I watch a youtube video or do more than one speedtests.
I have a 10 meters long cable along the walls from the living room, where the router is, to my room. I've had the cable like this for a while and it worked before with no problems. I've tried to connect my laptop to the router with a short ethernet cable that came with the router and also had no problems with it, so I bought a new 10m long cable thinking that it's the old cable's problem, but I've had a same issue like with the old one.

Wifi works completely fine, got a new router like 2 weeks ago, also my speeds are good (100mbps down, 10 up).
Tried to reinstall ethernet drivers and install latest drivers from vendors website (broadcom)
My os is windows 10.

Any help would be appreciated :)