A few years ago I had a voice fault, in fact a few neigbours did at the same time. It was due to an e-side cable being dodgy.
I was swapped to another e-side pair. It cured the fault but resulted in a loss of 700kbps sync

. Nothing to be done.
Then that one got progressively worse and I started getting frequent spells of perpetual disconnections, only cureable by running the quiet line test, of all things. I didn't dare report it, for fear of what might result.
That was one of my reasons for going to FTTC. Phone can get crackly, but so what?
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My broadband basic info/help site - www.robertos.me.uk
My domains,website and mail hosting - Tsohost.
Internet connection - Plusnet Value Fibre.
"Where talent is a dwarf, self-esteem is a giant." - Jean-Antoine Petit-Senn.