Noise Margin
Hi pierre, Chris & snarf
well snarf I was going to say something similar, the reason for doing it between 9am -3pm is that noise levels are generally lower. However, that said, because your last sync was at 9pm last night and your SNRM was dipping to 2db, I would actually recommend doing it after dark (although there are risks) because if you achieve too high a sync, as you have already observed things won't be stable 
It may be (guessing from stats posted) that your target SNRM is still 6dB, the last thing you want is line drops for the exchange to raise the Target, and hence probably get poorer results.
Especially because you have had some drops recently, what I recommend is always power down the modem/router and wait several minutes before disconnecting any line - mastersocket/filter/cable etc. This is so the exchange sees the power down and hopefully doesn't interpret it as a line drop. Wait a good 5 minutes in your case, before unplugging. Don't powerup again until you have finished plugging everything back in.
Don't do this more than 5 times in an hour, and then leave it for the rest of the day.
You really should plug into the "test" socket which is behind the master front plate, unless you have no fixed extension wiring connected to the rear of the front plate - that's the front plate not the rear of the box itself!
Is your extension wire fixed or plugged into the master socket?
Once you have connected to the master/test socket take a set of ADSL line stats immediately after the line syncs. The will give a good indication of the Target SNRM. The only "risk" of doing it when noise levels are higher is that if you happen to sync when the noise dips, and it then comes back after you get a high sync speed your SNRM may plummet.
If things seem fairly stable once connected, leave it alone and post back some more stats later, especially if you spot any larger changes in SNRM, but especially tomorrow morning after 9am.
Tell us more about this extension and why you think it may be "failing".
well snarf I was going to say something similar, the reason for doing it between 9am -3pm is that noise levels are generally lower. However, that said, because your last sync was at 9pm last night and your SNRM was dipping to 2db, I would actually recommend doing it after dark (although there are risks) because if you achieve too high a sync, as you have already observed things won't be stable It may be (guessing from stats posted) that your target SNRM is still 6dB, the last thing you want is line drops for the exchange to raise the Target, and hence probably get poorer results.
Especially because you have had some drops recently, what I recommend is always power down the modem/router and wait several minutes before disconnecting any line - mastersocket/filter/cable etc. This is so the exchange sees the power down and hopefully doesn't interpret it as a line drop. Wait a good 5 minutes in your case, before unplugging. Don't powerup again until you have finished plugging everything back in.
Don't do this more than 5 times in an hour, and then leave it for the rest of the day.
You really should plug into the "test" socket which is behind the master front plate, unless you have no fixed extension wiring connected to the rear of the front plate - that's the front plate not the rear of the box itself!
Is your extension wire fixed or plugged into the master socket?
Once you have connected to the master/test socket take a set of ADSL line stats immediately after the line syncs. The will give a good indication of the Target SNRM. The only "risk" of doing it when noise levels are higher is that if you happen to sync when the noise dips, and it then comes back after you get a high sync speed your SNRM may plummet.
If things seem fairly stable once connected, leave it alone and post back some more stats later, especially if you spot any larger changes in SNRM, but especially tomorrow morning after 9am.
Tell us more about this extension and why you think it may be "failing".
