I've been having problems with my FTTC connection since January. Having been perfectly fine for a number of years it suddenly became very unstable and started dropping regularly overnight.
I am roughly 2km from the cabinet unfortunately so it's never going to be great.
I've now had 8 openreach engineers who originally found lots of battery on the line. They swapped connectors. They did a lift and shift, they swapped the line. They changed my E side to a different line. Initially there was battery on the line which seemed to go after changing things then come back for the next engineer. I think that's now resolved.
They recently messed with the profile and enabled interleaving which dropped my sync speed from ~20 Mbps to 12 Mbps but the line did stay connected for 4 days straight albeit with 55 million FEC errors and 113 CRC errors.
The last engineer then reset the profile and it jumped up to syncing at 17 Mbps. The handheld device they use shows no FEC or CRC and nor does my router initally whilst the engineer is here but then it appears at certain times it goes ballistic and unfortunately my line seems to be unstable again dropping out overnight. So of course whenever they are here they don't see the errors. My router reports far end stats but BT don't seem to be able to see those?
It seems like it's some sort of interference, but one thing that has started occurring since this fault is that it now takes an incredibly long time to actually sync with the exchange. It can be anything from 2 to 10 minutes. Several of the engineers couldn't actually get their devices to sync at all. The second to last engineer took 20 minutes to perform his close out test because his device kept timing out before it could complete it.
None of the engineers seem willing to investigate the slow syncing time though and just say some cards are slower than others. Does this seem normal to anyone else and is it possible it's contributing to the sudden drop in line quality?
If openreach's own tests can't complete easily then how can it be normal?