Qubes main Tollbar dissapears

Sometimes main toolbar dissapears when i click on it to open menu. Then after some time all open windows dissapears and only desktop image is visible. Need then a hard shutdown to restart the OS. Any ideas? How can I debug this? Dom0 is updated

You can try to open the dom0 terminal pressing Alt+F1 → Open Terminal Here.
You can then try to run the panel from the terminal using this command:

xfce4-panel --restart

And check the logs in dom0 using journalctl command in dom0 terminal to see why the panel crashed.

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