https://bugs.kde.org/show_bug.cgi?id=450801
--- Comment #1 from Daren Lee ---
many other poeple on the internet complaining about exactly the same issue in
Debian 11 / KDE. No resolution yet.
https://www.reddit.com/r/kde/comments/snhb2c/kde_panel_plasma_frozen_what_to_try/
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You are
https://bugs.kde.org/show_bug.cgi?id=450801
Bug ID: 450801
Summary: Many complaints of taskbar/application menu freezing,
workflow is totally disrupted, users are really
frustrated; only rebooting can restore functionality.