High packet loss and download speed decrease since Saturday morning

[#1]

My connection has been consistently good since I swapped to fibre most of 2 years ago.

As of 10am Saturday morning the packet loss has increased and when I came to test (having had my suspicions) the speed from any device (cable connected or not) is very slow.

https://www.thinkbroadband.com/broadband/monitoring/quality/share/bd20f66501fc3ea0fd4c7687faaebd11208eba65-05-05-2018

Nothing from the router regarding line statistics suggests anything to me (these are down - towards me)

Actual Rate 79997 Kbps 
Attainable Rate 81214 Kbps 
Path Mode Fast 
Interleave Depth 1 
Actual PSD 6. 7 dB 1

I tried reconnecting. Nothing changed.

[#2]

Now that's odd !

This morning I power cycled my router (a Draytek 2860) and when I reconnected the speed was back to normal (71 Mb/s down/18.6 up).

Prior to the power cycle it was 3,61 down 19.1 up.

While it COULD have been the router I suspect not. The problem came on when I was away on holiday extremely suddenly (as can be seen from the Think Broadband graph).

My suspicion is that when I power cycled, when I reconnected I moved to some "better" part of the Plusnet infrastructure.