Timeouting TP-Link TL-WR841N router – Avoid buying

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