I'm guessing there is some random noise problems on his lines that is causing his drop-outs.
There is no random noise. There was only ever the one drop out which happened on a Sunday afternoon. The next day there were drops and re-syncing at 1Mbps.
I initially reported the problem as a disconnect over the two days.
The slow speed is a result of the Openreach engineer changing my ports. I was getting speeds of around 60Mpbs stable for around 4 years previously.
Are you allowing the router to be always on? Make sure to not switch off the router to see if interleave will settle and correct itself.
Also, you are positive that the router system uptime is not resetting itself? Because a faulty router or a router that overheats can cause itself to reboot itself triggering DLM to lower its speeds. Make sure not to place router near the central heating.
Have you checked with another router to confirm if the issue persists? What about your neighbours, are they having issues with their connections as well?
I see you posted your stats. Have you observed if your noise margins are stable at all times?
Regardless of what speeds your connection settles to, even if it was low, the router and connection up-time should remain stable! Even in the event of crosstalk, while it may contribute to speed reductions, your connection must not drop out frequently.
You should log in to your router settings and observe these stats every day to find out whether your connection has remained stable and if not at what time those drop-outs occurred.
Openreach changing port was probably a mistake as you say you had problems before the port was changed.
You say you were with EE, is this in the same property that you lived in? Did the switch to Pulse8 cause this issue shortly afterwards? It could be the ISP or the router supplied by the ISP that's the fault.
If Pulse8 is a monthly rollout contract, I suppose you can end it and switch back to another ISP and see if the problem resolves itself?