So here’s the deal you’re in the 1.2 gig zone. Shit ain’t cheap. All troubleshooting happens on your end. Cables, cords and issues are on you.
If you are unfamiliar there’s no such thing as limiting speeds. Roku? It’s a lie. Asus you can go in a restrict and slow. It’s work. Other option you shut down when you get close. You get 3 complementary overages a year last I knew. The issue you. Can’t fight the speed. It’s gonna go as fast as it can. Speed used to be a 75 modem and router. It’s not. My modem was 150, had a coupon. Wi-Fi. What’s your budget. Unless you’re buying to slow there will be many instances you need to take the xfi unlimited deal.
Replace the splitter. Splitters go bad. I just replace them to be safe if having any issues.