Thanks for the additional info, I think that helps clarify a few things about what may have been going on.
It seems like previously things were unstable, and Im hoping that by changing what you have done has now made the line more stable.
The figures after the resync would seem to confirm that it is the router firmware that is displaying the output power the wrong way round. - Power output can sometimes drop after a while if your SNRMargin goes too high above your Target SNR, which is why I wanted to see a resync to see what your Target SNR is.
As HP has already said your Target SNR is 15dB, which is a sign that over the past few weeks youve been experiencing very unstable line conditions, disconnections and ties in with the speed reductions.
What we need now is a period of stability on that line and hopefully your Target SNR will reduce, which will in turn allow the router to sync at higher speeds.
I can now perhaps see why your ISP are a bit reluctant to get involved right now - if they requested BTw to reduce anything, based on the past instability the answer would probably be No.
As HP said, that line needs a little bit more monitoring to see if things have improved particularly in the evenings.
I know where HP is coming from with the restart once a day, but on this occasion I'm going to suggest leaving it connected for a few days - or at least making sure that you make a note of what your sync speed and SNRM is before you do the resync as I want to make sure that the router is holding that 4224 sync.
Unfortunately it doesnt look like the router records your uptime... and if it is auto resyncing in the evenings... doing a resync in the mornings could upset that.
I dont know how adept you are with PCs and Im not sure if
routerstats will work with your router, - with a bit of messing you may be able to get it working with the full version.
If you can it will take away a lot of the hard work of the monitoring your line.
Also keep checking the BTw IPprofile, Im hoping that it will soon change.
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Note to self
USR 9105 uses BCM6345 chipset - may work with DMTv8