@andreaferns120472 Ok, just a thought. Have you got a spare micro filter lying around?
If so, try un clipping the front of the NTE 5 to reveal the test socket behind it. Plug the micro filter into that. And the small cable connector (not the phone) from the SH2 into the micro filter. If you’ve got a spare thin black cable for the SH2 to the NTE 5 connection, then replace that too..Keep it like that for a day or two and see how things go.
Between them the BT and Openreach engineers should’ve already eliminated an issue with the NTE 5 and the cable - which is what you’re doing here - but you never know. And it’s something you can try very easily.
