Well, my connection re-synced yet again this morning.
This time, sync speed was increased to 27396 k.
SNRM is currently at 8.3dB & the attainble rate is 30700 k.
I can't understand why, especially for my connection, Interleaving is still completely OFF.
Again, I can see nothing in my logs to suggest a reason for this latest re-sync.
Over the months, I have had a port flex, a lift & shift, copper pairs swapped, the E-side disconnected & the D-side tested, my drop wire replaced etc.
As far as I am aware, no repair work whatsoever has been carried out (or anything even checked) within the fibre cabinet itself.
I am only a now confirmed 834m from the cabinet.
I could almost accept permanent low(ish) speeds over that line length, but not the instability which just HAS to be a really easy fix (once someone can actually pinpoint it), doesn't it?.
I genuinely thought last weekend's engineering work had more or less resolved everything.
Unfortunately, it appears the saga will have to continue, hopefully not for too much longer.