Internet is fine. Everything works as it should. Xbox gaming is fine for everyone... Except Rocket League. 

Every game I get Latency. Yellow/Red ping errors, when googled its because my ping is too random

I've tried wired into the Deco M4, I've tried wirelessly connecting to the M4, it's worse. 

It's made the game unplayable. 

I have Virgin Media Superhub 3, which was fine with it all before for a long while. But some people talk about static IPs and port forwarding, but that sounds nonsense. 

It just appears to be the Xbox being connected to the Internet through the M4 which is the main M4 which is plugged directly into the Modem (Router in modem mode).