Thanks for the prompt response.
I did that and replicated the problem. That's pretty easy as it almost happens immediately - to the point I have to rush into settings to turn either WiFi or CEC off or I won't get a chance.
I did the paste system logs, there was two options - the crash log and normal so I did both.
Crash version:
https://paste.libreelec.tv/ethical-sawfly.log
Normal:
https://paste.libreelec.tv/proud-flea.log
Then I thought maybe I should replicate it with the default skin just in case.
Crash version:
https://paste.libreelec.tv/fluent-snail.log
Normal:
https://paste.libreelec.tv/stirred-rat.log
I noticed on the debug display when WiFi and CEC were both on the FPS would drop to 0.3, and the Kodi-CPU would shoot up to nearly 200%, and that is not even doing anything, just in the menu.
Thanks again.