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you need to check that there is no dial tone from test socket to ensure problem is external and not internal wiring if external then phone 151 and report phone fault not broadband
After 4 calls to BT - one disconnected, one heard the issue and it then stopped after switching to the test socket, but returned after the call ended, one told me to buy a new BT socket "from a shop" and fit it myself!!! And the final call ended with an engineer booked for tuesday.
Problem is intermittant. Sometimes worse than others. Quiet test (17070) shows an issue 4 times out of 5. Also happens on the test socket so i am confident this is a line issue. No extensions connected to the master socket and problem happens with moden wireless phones and one cable telephone.
I'll take this to the phone forum.
Edit to Add:
Just seen router stats!!
0 Days, 0 Hours 9 Minutes
0 Days, 0 Hours 36 Minutes
But if the phone is picked up the router drops the connection......