Update on my PM - Zwatt took the cover off, checked the electronics and could find no issues. They then did a comparison with a pair of Vectors and the power was spot on. I’ve been using it for the past couple of months and the output feels about right.
It has shifted my focus onto my gen 1 Kickr , erg mode and the power readings. I’ve been experiencing multiple issues over the past few weeks but this is probably one for the power match thread.