This solution kind of sucks to have to do and i'm not sure it would work for you, but it worked for me and i'm very happy. Today I switched to a new ISP and got a new router along with it, and now it is working perfectly, I am assuming that it was the router, not the ISP though. Like I said, it sucks to have to do, but maybe you could try getting a router if you really want to play ark that much? I think it was 100% worth it though because I was needing to switch anyways and upgrade