kitz you not alone, I had a shed ton of errors yesterday 8am to midday, they happened at normally a quiet time of day so out of the blue. Interleaved later today I expect.
Given you witnessed them doing works, I wonder if all the other occasions was them fiddling?
Roberto on TBB once witnessed someone fiddling in his cabinet, the guy only had to slightly touch his wire with his finger and it triggered a error fit on the line.
I did setup dslstats to email me when the ES exceeded a configured rate, which would allow me time to shut down the line to prevent DLM, it worked as expected (thanks eric), however I didnt see the emails until about 5 mins ago as I was playing a game at the time and I didnt setup one of my high priority accounts that go to my phone.
Looks like silent noise on my line, snrm, bitswaps and other metrics none of them budged during the error bombardment. I could exceed the 25% loss in a short time metric as going from 3db fast path to 6db interleaved.
I checked your line and wow, both our lines started their noise burst at 8am, the same hour.