Massive SNR Jump on FTTC

[#1]

My Billion router 8800nl has a big jump on downstream snr from 6.9dB to 13.9dB but there appear no retrain on the line as the VDSL was ongoing connected to the cabinet for 194D 5H 46M 12S and ongoing connected to Plusnet for 51 Day(s) 21:46:30

Maybe DLM decided to put up snr?

[#2]

If there was no retrain then I cannot see that the S to N change was as a result of DLM.

Perhaps an other user has turned their modem off resulting in less crosstalk and hence a better S to N?