Since I zypper duped to TW 20201030 on my laptop[1] I've got freezes for some
seconds up to tens of seconds. Nothing conclusive in the logs and nothing weird
in dmesg. I suspect the kernel as I rebooted with the old kernel,
5.8.12-1-default, and everything worked as before.

A weird work around from the freezes is that if I (in plasma) hit alt-tab the
system goes back to being responsive, but only until next short freeze. Still
nothing conclusive in the logs.

[1] https://linux-hardware.org/?probe=543c444fdf