Update on this, I have sent all details to @MaxineN so hopefullly somebody will be able to look into it.
The problem continues if wired (desktop) or wifi (android), with wifi disabled and wired only, with wired disconnected and wifi only so I am 99% sure it's nothing this end. It would be interesting to know if anybody else in the Hillmorton / Hoon Hay area of Christchurch on HFC has noted any problems.
I have been collecting speed test data and traces at 5 minute intervals (to the Christchurch One NZ speedtest server) for the last 9 days, here's a chart of Upload speed (negative = total failure), and Packet Loss (100 = total failure)
Leftmost is 12am on Sunday 27th of August, Rightmost is 11:50am Tuesday 5th September
If anybody else should be interested to collect similar data for themselves, here's the bash script I'm using.
https://gist.github.com/sleemanj/7edc2042ac5ed1631020c0473bde443a
(uses Speed Test CLI)
Upload Speed Mbps
Packet Loss %

Packet Loss Exhibiting ip4 MTR
Start: Thu Aug 31 10:19:25 2023
HOST: mortimer Loss% Snt Last Avg Best Wrst StDev
1.|-- ultrahub.hub 0.0% 30 1.1 0.8 0.5 1.1 0.0
2.|-- 203-173-183-254.dsl.dyn.ihug.co.nz 20.0% 30 26.5 18.5 9.3 27.3 6.2
3.|-- 203.97.45.174 16.7% 30 18.1 20.8 9.7 40.4 9.4
4.|-- 203.97.45.173 13.3% 30 15.4 14.9 6.6 26.7 4.0
Packet Loss Exhibiting ip6 MTR
Start: Thu Aug 31 10:19:25 2023
HOST: mortimer Loss% Snt Last Avg Best Wrst StDev
1.|-- **redacted ip6** 0.0% 30 0.7 0.8 0.6 1.2 0.0
2.|-- bng1-tstc-chc-lo20.vodafone.co.nz 26.7% 30 11.0 15.2 10.7 31.8 5.1
3.|-- 2407:7000:cdcd:53::2 20.0% 30 20.1 20.1 11.0 47.4 9.6
4.|-- 2407:7000:cdcd:53::1 20.0% 30 11.9 12.8 7.1 20.2 2.5

