Timeouting TP-Link TL-WR841N router - Avoid buying HD

So recently bought a simple router for a simple internet sharing for my laptop. So guess what. I will have to return it. This is a video demonstration how router itself causes timeouts. And this is way: • Constant internet speed drops • Slow conectivy, random internet stops • And appearantly timeouts What I did it double check? Plugged just the cable to my PC works fine. So: • Replaced my cable • Turned off all security settings • Restarted multiple times Still lags... 300M Wireless N Router Model No. TL-WR841N