At around 22:50 last night I moved the router about two feet away from the modem (mounted right next to it)
That's a dramatic effect, but I'm sure it shouldn't be anything like that. I wonder if there is a dodgy power supply as part of the router?
I might power off the modem and rearrange it all or leave it until tomorrow and see what the DLM does - what do you think? It's likely I guess that the line just can't handle the current IP Profile with the rubbish that's around?
The way DLM works is that, yesterday, it ought to merely have been triggered into monitoring, because you were turned on for more than 15 minutes. Today should become the real first day to monitor, and the first decision to intervene should be made early tomorrow morning, based on data from today.
DLM can intervene faster is you are *really* unstable, but I don't think you are there. My first line showed constant 4% packet loss for the entire first 48 hours, and didn't trigger DLM into early intervention.
If you want to play around with it, you should be safe to rearrange into a better organisation... so long as you power off the modem before disconnecting it from the phone line. But it probably isn't the best time to experiment with a variety of setups, some of which might be bad.
I know that if we lose power to this road, the SNR margin here increases by 4 - 7dB...
We had one re-sync, in 2012, where the QLN graph shows suspiciously low noise levels above tone 400. My theory is that the FTTC cabinet dropped all connections, so the QLN measurement has *no* neighbouring VDSL2 modems running. Could have been a power event of some sort.
I've coded in the hourly Errored Seconds graph now. Doesn't make pleasant viewing when things are bad, much better than it was earlier though.
I'm pretty sure that it is the ES rate that DLM monitors. You definitely want that to be looking pleasant!