NZCrusader: Have been getting this quite a bit with the pixelation of channel 1. (also in Chch).
Grandmother and her friends on Freeview get it too. She even asked a Chch Freeview installer who said he gets that too.
I assumed it was just me until they said they get it too and I saw this thread.
Spark FibreMAX using Mikrotik CCR1009-8G-1S-1S+. UAP, UAP AC Pro, UAP AC Pro Mesh, Apple TV 4, Apple TV 4K, iPad Air 1, iPhone 6s, VodaTV Gen 2. If it doesn't move then it's data cabled.