I'm running Ubuntu 17.10 with XOrg (Wayland was impossibly laggy).

Every few seconds the window manager will stop updating. Just the mouse
keeps on moving, but videos playing will continue.

If I wait a half a minute, it will resume. If I switch to ctrl+alt+f1
and log again, it resumes too.

In the log I see:

Feb  2 14:08:17 fc993847 org.gnome.Shell.desktop[17388]: Window manager 
warning: last_user_time (332294169) is greater than comparison timestamp 
(332288825).  This most likely represents a buggy client sending inaccurate 
timestamps in messages such as _NET_ACTIVE_WINDOW.  Trying to work around...
Feb  2 14:08:17 fc993847 org.gnome.Shell.desktop[17388]: Window manager 
warning: 0x4000045 ((39) Why A) appears to be one of the offending windows with 
a timestamp of 332294169.  Working around...
Feb  2 14:09:06 fc993847 org.gnome.Shell.desktop[17388]: Window manager 
warning: last_user_time (332347345) is greater than comparison timestamp 
(332338937).  This most likely represents a buggy client sending inaccurate 
timestamps in messages such as _NET_ACTIVE_WINDOW.  Trying to work around...
Feb  2 14:09:06 fc993847 org.gnome.Shell.desktop[17388]: Window manager 
warning: 0x4000045 ((39) Why A) appears to be one of the offending windows with 
a timestamp of 332347345.  Working around...


The name of the offending window varies with whatever I'm focused at the time, 
doesn't matter what it is.

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https://bugs.launchpad.net/bugs/561294

Title:
  Not a helpful or appropiate error message displayed

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