Created attachment 714863 [details]
one of the many segfaults I get

While working with Dolphin, KWrite, Atom, Firefox, LibreOffice etc ...
Plasma/Plasmashell segfaults fairly regularly and restarts itself, about once
an hour at least. It seems to be related to resizing, moving and maximizing
windows, as far as I can tell, though I cant reproduce it reliably and it also
happens out of the blue while I am for instance just typing text. It's
annoying. After a segfault occurred, some window manager functions like
maximizing a window by double clicking on its title bar just do not work
anymore for a couple of minutes. 

System: openSUSE Leap 42.2, all current updates applied, PackMan repository
activated. NVidia graphics card G92 [GeForce 9800 GT] with latest NVidia driver
installed. 

I attached a backtrace. I'd be happy to provide more info if I knew what I was
looking for.