Anti-Cheat not working after a new Router

What appears to be working for me is resetting the router, but I can't understand why that would work, and what the issue is in the first place. 

I am trying to get assistance from my ISP, but needless to say they all seem baffled by the issue. The worst thing is that starting Apex seems to kill my download speed altogether, and all of a sudden YouTube and everything else starts working like crap, and I have 500 mb optic internet THAT I BOUGHT SO THAT I COULD PLAY APEX SMOOTHLY.