Hey everyone, im a first timer here so I hope you guys understand my confusion

To the problem: 

I cant go on Steam online, League of Legends or any online/service game for that matter

It sometimes doesnt load progression sites (like confirming to activate my tp link forum account) which I was only able to accomplish using my flat

I can use normal browsing, watch youtube, check instragram or scroll thru any social media / blog / random websites

We just got this router today and these problems have been on my nerves the last 6-7h hours

Any ideas on why that is? Any information what I could do? 

Cheers and thanks