Offline System Update Diagnostic Tool on Xbox One: http://bit.ly/1e8bSs3 Network ports used by Xbox Live on Xbox One: http://bit.ly/1dCNLm0 xBox Support: http://bit.ly/1lE2QrK Xbox One operating system versions and system updates: http://bit.ly/1NiJS1j
Welcome to the community and thanks for posting. Sorry to read you are having an issue with the connection.
From checking your line, the Modem SNR for downstream is too low at 31 dB and the upstream is high at 52 dBmV. For this I would like to book an engineer appointment to check this over and have sent you a PM (purple envelope icon, right corner) with some details for you to confirm please.