Public bug reported:

I am reporting this as a separate bug because the earlier bugs apply to
earlier versions of Ubuntu and have been invalidated.

My system is Ubuntu 17.04 (updated not clean install)

The problem occurs after a few hours of work.

Steps to reproduce:
1. Keep working on the system for some hours
2. Press the Left Win key to get into search mode

What happens then:
An overview of windows will be displayed. The UI will freeze or become 
unresponsive. Mouse pointed can be moved around but clicking on any window 
thumbnail does not give the focus to it

Switch to a shell using Ctrl+Alt+F1. Run top. gnome-shell is at the top
with 100% CPU usage.

I tried disabling some extensions to see if these cause the problem. I
also tried changing the gnome-shell theme to default but no impact.
Problem remains.

If someone could point me to what more information needs to be gathered,
I will be happy to provide it.

Thanks

ProblemType: Bug
DistroRelease: Ubuntu 17.04
Package: gnome-shell 3.24.2-0ubuntu0.1
ProcVersionSignature: Ubuntu 4.10.0-22.24-generic 4.10.15
Uname: Linux 4.10.0-22-generic x86_64
ApportVersion: 2.20.4-0ubuntu4.1
Architecture: amd64
CurrentDesktop: GNOME
Date: Mon Jun 19 16:57:19 2017
DisplayManager: lightdm
InstallationDate: Installed on 2017-01-16 (154 days ago)
InstallationMedia: Ubuntu 16.10 "Yakkety Yak" - Release amd64 (20161012.2)
SourcePackage: gnome-shell
UpgradeStatus: Upgraded to zesty on 2017-04-17 (62 days ago)

** Affects: gnome-shell (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: amd64 apport-bug zesty

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https://bugs.launchpad.net/bugs/1698792

Title:
  gnome-shell hogs cpu

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