Valentin Nechayev, please don't apport-collect from different machines. If you 
have an issue with different hardware, it is most helpful to file a new report 
instead via a terminal:
ubuntu-bug xorg

Despite this, this appears correlated to a KDE'ism. Is the issue
reproducible if you use GNOME? One may test a live environment via to confirm.

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  Spontaneous single window freezing

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