This may sound weird and don't ask me why because it doesnt make sense. But i recently had this problem. I portforwarded, enabled Pnup. opened my nat, made a static IP for my Xbox. Still i was getting disconnected ever 3-5 minutes. I was using a wired ethernet
connection. HOWEVER. I had a wireless router also attached to my regular router for the laptops. I unplugged it. and now everything is working fine.
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