Over the course of a day or so I did 3 or 4 reboots of the router and finally a total of three Factory Resets before finally resolving the issue. I suspect this sequence of events has caused a noticeable reduction in my sync speed.
The first image shows what my previous sync was prior to these resets (the sync had been rock solid at these numbers for as long as I can remember). The second image shows what the current sync rate is, after my mucking about. My question is, will my previous excellent connection naturally return over time, or do I need to contact anyone to organise a reset of some sort?
The only other thing that may figure in the mix is the three power cuts we had in quick succession a week before, when a lot of England was affected. Thank you for any advice offered.