I'm using KDE as well (after giving GNOME another shot for a week, which had even more issues), though I installed KDE in parallel, so there's always the chance that some GNOME residue is causing those issues.
What kind of issues ? is X or Wayland crashing and you are losing your work? I am still on X11 , in rare cases X crashes and is probably the video card/nvidia driver issues since all crashes happened when I had some 3d GPU stuff happening.
Using Ubuntu on a daily machine for 6 months, after 15 years of Fedora, that's how I would describe my entire experience. Buggy.