[Solved] - Tower's 1st [no, 3rd] Hard-Reset since clean-reinstall.

[Pliny.D.Elder]

Oh rats Pliny -- it took me ages to compose my previous reply, & once i'd posted it, i saw that you had added some stuff to the end of your original post -- haven't had time to look into any of that, but will later - thanks.

And might I say your previous reply was written with the mastery of a great Mozart symphony.
!st.... I was not suggesting that you make some of them changes permanent. Was only to see if there was any improvement over the next few days. You could back up your settings with Timeshift before doing any changes.
2nd....The history.log was only useful if you have a good idea when your problems started.
3rd....Did you at least try........

Code:

sudo apt-get install --reinstall xserver-xorg-input-all kwin

4th.... It is only advice, so you obviously must make the decision of whether it sounds right for you. I have found a lot of glitches can be remedied by elimination, at least that's how I stratagize.
5th.....Yeah I forgot those links the first post so I edited them in. Good luck