Evening DM et al
Just needed to post an update.
The issue has persisted randomly and because thankfully it is not too frequent I forgot to get another vanilla mouse to eliminate the Trackball
However the reason for the posting now was that it happened again this afternoon but a new thing was that all the fans which with the exception of the CPU fan which is connected to its header are direct wired to the PSU (fan controller is on the shopping list for the future) all were running at very noisy speed ~ almost as if they were running over-volted so to speak!
It was not obviously to me the CPU fan as well but the various case fans only?
Could my issues be something to do with the PSU is some odd way???