im having the same issue however mines due to a phone line error call bt and ask them to test it.i would say por forward and the new hh5 are good options but at the moment and current state of my internet none of them made a difference to me
When I contacted BT just over a month ago they said they did thorough checks on my line and found nothing wrong.
not sure what your problem is but mine has been confirmed as a local network error you can do you own line check by calling 150 and saying line check i think it is
its both i was running 78mb download 15mb upload abd around 20ms ping
now it can go down to 1mb download 0.5mb upload and over 200ms ping
sat at 30mb/d 15mb/u 200ms/p
I've seen on another thread from years ago (amazingly people had a problem with FIFA 12 with BT too, I was with Sky back then so I wouldn't know,) if you connect to the BT test socket directly it eliminates any problems which may occur in terms of internal routing.