I have a Billion 8800NL router which appears to sync much faster that other users on my cab
I think quite a lot of us see that. It frequently happens with the HG612's and I sometimes see it too with my Zyxel, so I think its possibly the BCMs.
I just noticed mine is also currently running at 4.9dB and giving me a bit more sync speed too. Not quite sure what happened at about 4-5am this morning - whatever it was looked to start sometime around 4am and took my crosstalker off line. It looks like their modem tried to come back up, but then went down again. In the meantime mine did a resync whilst they were still offline... then subsequently lost SNRm when they must have turned theirs back on again.
I should in theory perform a manual resync to bring my own SNRm back up to 6.3dB, but tbh it seems stable enough and still showing as MBTE Green.
When my line does start kicking off the Err Secs run into 10's of 1000's so I doubt its going to make much difference.