It's looking possible. However I have just had another thought. You havent had any power surges or power cuts have you?
Now, funny you should mention that, we had a power cut last night at about 10.30pm. So that could account for all the errors this morning. But it wouldn't account for the SNR going up and down like crazy the two days before.
I've just ordered a 2nd hand HG612, so as soon as that arrives I'll plug that it and get it logging again and we can see if we get similar SNR issues.
I've just found the "Average error rates per day" text file that DSL stats produces. Here it is:
22 Aug 2018
CRC errors per hour: 32785 Down, 0.20 Up
FEC errors per hour: 7095723 Down, 0.71 Up
HEC errors per hour: 0 Down, 0 Up
ES per hour: 1913 Down, 0.20 Up
SES per hour: 746 Down, 0 Up
Total ES in the day: 18732 Down, 2 Up
21 Aug 2018
CRC errors per hour: 1511 Down, 0.72 Up
FEC errors per hour: 403075 Down, 1.22 Up
HEC errors per hour: 0 Down, 0 Up
ES per hour: 82.2 Down, 0.63 Up
SES per hour: 32.4 Down, 0 Up
Total ES in the day: 1949 Down, 16 Up
20 Aug 2018
CRC errors per hour: 0 Down, 1.05 Up
FEC errors per hour: 130038 Down, 2.59 Up
HEC errors per hour: 0 Down, 0 Up
ES per hour: 0 Down, 0.91 Up
SES per hour: 0 Down, 0 Up
Total ES in the day: 0 Down, 15 Up
[Moderator edited to fix a typo. (s/HG621/HG612)]