[tech] Help with weird disconnection

Hi I'm looking for some advice to fix a problem i am having when playing Forza 6.

When I play multiplayer I am getting disconnected from lobbies and chat. There is no warning from lag or anything.

I have tried starting the game again, holding the power button down to restart the box, turning the modem and router off and on again.

I've done the network and live tests both of which were fine. My ping and MTU (1480) are ok.

My net is 100mbps cable and everything else works fine. The xbox says it is getting 53.25 down and 29.14 up with 0 packet loss.

The relevant ports are forwarded and my NAT is open.

This has been happening over the last 2 weeks and I have changed no settings on my network in the last 6 months.

Xbox live says it is still up and fine.

Thanks in advance.