This. I just started playing with Linux desktop in a VM and I'm not sure if it's because it's virtualized but I've had to kill plasma and relaunch or reboot several times because KDE is playing silly buggers.
You could try booting KDE neon Unstable in a VM on the same machine. If you can still reproduce it I'm sure the KDE devs would appreciate a bug report.
I have a new workstation arriving next week that will be dedicated for work and I want to first try Linux. Everything I need has a Linux client, and I have a license for VMware workstation which also has a Linux version so I can boot up Windows if I need to.
I love the speed. KDE can be made to look really nice. But I picked straight up Debian as that's the distribution I've been using for servers for years and I wanted stable. Maybe I need to go to Arch.