I will try to identify the root cause instead of playing with fire, but
thanks anyway.
All opened apps work fine and I can open a terminal from keyboard so if
there are logs I can check once I get the next freeze, let me know.
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Most likely kernel issue. Downgrade to 4.2 and see if that helps.
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https://bugs.launchpad.net/bugs/1710105
Title:
launcher and top bar freeze
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Status changed to 'Confirmed' because the bug affects multiple users.
** Changed in: unity (Ubuntu)
Status: New => Confirmed
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https://bugs.launchpad.net/bugs/1710105
Title:
laun