Been having the same problem here as well. BT Infinity 2 on Home Hub 3. Although it seems to be occurring on Warframe to an extent now as well. No idea if BT have changed anything on their end recently but I had not changed any settings within the Home Hub menu.
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I have the home Hub 5, tried turning Upnp on and off, literally makes no difference! Just annoying cause I can barely play any of the new content!