I has this problem a few years back. I reported it as a voice fault, I didn't mention broadband, which was just about holding on at much reduced speed, luckily their line test found a problem. They ended up having to dig up the pavement a bit down the road from me and fix a problem underground.
BT Infinity 2
Edited by _Resonance_ (Wed 11-Jan-17 04:31:31)