Zigbee device network issue

Note this issue is about devices connected to Z2M, however I believe this is a more fundamental issue due to it happening when home assistant is powered down. Am pulling my hair out so any help appreciated.

I recently installed solar PV and since have been having the strangest of issues

I noticed that a bunch of Aurora Aone sockets and plugins were turning off (the behaviour they would exhibit if they lost power for a second or so). Occasionally I have an odd light that turns on (gledopto and aurora), also their default behaviour in case of power issues.

I turned off and isolated the solar PV, still the issue occurs.

I turned off and powered down Z2M and HA. Still the issue continues.

I got some brand new never used devices, 1 I did not join, it is fine. 2 I joined and had same issue. These two I then moved to a spare aurora zigbee hub and they no longer exhibit the issue. I assume it’s on a different channel but don’t see any way to check in this closed system.

I’m not experiencing power issues as far as I can tell (no flickering lights), so I can only think some rogue device on the main zigbee network or some kind of zigbee interference.

Anyone ever seen such behaviour or have any theory?