I just seen this on the Internet as I was searching for a remedy for my xbox as I am having the exact same problem with my xbox one x.
I am however with virgin media not bt and was wondering if you managed to sort it.
I have had the problem for a year now and its only my xbox one x that does it and only on ethernet.
Wireless is fine and my other og xbox is fine. Even using the same ports and cables so it has to be the xbox one x itself.
Solved! Go to Solution.
Hey! Never did figure out how to sort and just stuck with WiFi.
Others mentioned if you put a device between your router and Xbox it might help..something like a network switch.