1st banding.
1) 67 mbps
2) 74-77mbps
3) 15 months+
4) Slow incremental flooding of an underground cable starting way back in probably before 2012 with a old joints needing replacing on my line but the engineer tried to get capacitance of my line in tolerance but could not find the issue in 2012, got FTTC in august 2013 with full 80mbps sync, It descended to 54mbps as the line got worse very progressively, it was fixed in late summer 2014 when it finally killed my neighbors phone line.
5) My line also had interleaving at the time, I needed a Lantic modem to get back to fast path. I also had a no dial tone fault in mid 2015 due to a faulty line card, I also reported slow broadband too in hope of getting a DLM reset. even with the fix of an existing fault he wouldn't do it.
2nd banding.
1) 60mbps
2) 74-77mbps
3) since early jan 2016, 4th month and counting
4) a day after a flooded joint fault was fixed it at the turn of 2016 , my line was down at 15-30mbps during that fault with no dial no dial tone, it did jump back upto 67mbps after the fault was fixed then the 60mbps banding kicked in over night.
5) I asked for a DLM reset the engineer wasn't sure what I meant, was not a broadband engineer,never entered my home and didn't do it. My line is on fast path with an Lantiq modem. I'm on An ECI cab, my line currently sits with a 9.5-10db noise margin, 51 days and counting without a resync. I have given up rebooting every month and hoping the banding gets removed, average errored seconds per day stands at 150 since the last resync, so the line should be a solid green for DLM.
Edit: now on 5693609s or 65.9 days uptime about to hit 66 days of no resyncs sub 250es ( average 150es ) per day probable solid green status, with no DLM relenting intervention.