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Kubuntu 22.04: window manager freezes periodically requiring a reboot

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Periodically the window manager freezes. Running applications are still operational including terminal windows and other interactive app windows that are active for the mouse and keyboard. The keyboard can enter data and the mouse still moves its pointer but I cannot switch windows or desktops or respond to pop-ups. Top and mpstat show no stress on either the processors or memory. What diagnostics can I run to try to identify and narrow down the causes?

I sit in a Tesla and translated this thread with Ai:

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