Just to close this down, I did have to rather beat the PN reps into submission to get my line properly reset, but they did it in the end. It then moved to 3dB pretty quickly (DLM seems to work these days
) and stayed that way for some considerable time, many days, without a resync.
I then got hit by the big PN outage last weekend, but it's been totally stable at 3dB since then - almost 3 days now.
Problem solved I think.
