Hi
Been using kde neon for many years, But recently something has changed regarding updates, In the past a reboot was very infrequent. But over the past few weeks there have been many which are called 'system upgrades' ( sometimes daily ) which require a reboot to actually install software, which in the past was not required.
Anyone know why this change has occured ?

Because of the newoffline updates feature.
Unfortunately this happens on *every* update coming from the standard neon/Ubuntu repos. Command line updates and those for Snap/Flatpak/loo-and-feel items do not use this option.

https://blog.neon.kde.org/index.php/202 ... -are-here/
https://blog.neon.kde.org/index.php/202 ... re-coming/

and Discover will have a button to disable this soon
The method to turn it off manually is shown in the forum post I linked to.