Maui 17.06 has not fixed my longterm problems.

[kdemeoz]

What you can try are these things here. Try them one by one not all at once please.

1. Remove the plasma cache (just in case): ~/.cache/plasma-svgelements-default* files need removal and relogin
2. Disable VSync in Compositor setting
3. Try Xrender instead of OpenGL
4. Force usage of modesetting driver. Create a file with root rights in /usr/share/X11/xorg.conf.d/20-intel.conf with the following contents <<snip>> then try rebooting. If you only get a black screen please login via tty (Ctrl+Alt+F1) and save the Xorg.0.log from /var/log and remove the created file above.

I hope one of those steps will make things work again for you with Maui.

1. Did it, logged out/in, retested... KWin crashed.
   
2. Did it, logged out/in, retested... KWin crashed.
   
3. Did it, logged out/in, retested... KWin did NOT crash... but [per previous posts of mine in other threads] the price to pay for this new stability is unacceptable [loss of wobbly windows, desktop cube, magic lantern, desktop transition effects...]. An old cliche analogy is: do i choose to give away my first child or my second child?
   
4. Did it, rebooted ok, retested... KWin crashed.
   

So, #3 seems to indicate that using OpenGL [2 or 3.1] for compositing is associated with these chronic KWin crashes. How can we discover if this is mere correlation, or instead is actual causation? And pls remember, we know now that my hardware is not a factor... thus i presume that this is purely OS-software related... & hence should be theoretically curable... as openSUSE & KaOS seem to have managed.