Checking coredumpctl, I've gotten two plasmashell segfaults in the past 4 months, and recall hangs and crashes happening more often in the past (especially under NVIDIA drivers). Additionally plasmashell has hung a few times and/or kwin terminated unexpectedly, though I think this is a Mesa bug (https://www.reddit.com/r/kde/comments/zbux1i/where_would_i_s..., https://gitlab.freedesktop.org/mesa/mesa/-/issues/7674) or amdgpu kernel bug (I've had multiple GPU driver hangs and unusable screens on sleep-wake, usually preceded by kwin dying in the same session).
I also checked coredumpctl, and no KDE related crashes logged there, hence validating my experience. Funnily, both my desktop systems run on NVIDIA cards w/ NVIDIA drivers, and both have uptime numbers in multiple months at minimum.
The personal desktop I used to use was regularly suspended to RAM and woke back, and my work system is on 7/24. Both are running KDE, and never misbehaved. They are not lightly used systems either. Also both installations use KDE extensively. Akonadi, Baloo, KIO, etc. are regularly used.
