It sounds like gnome-shell crashed, which will make everything freeze
and the screen flash for a moment as it restarts. The apps keep running
because Xorg is still running and never crashed. So...

Thank you for taking the time to report this bug and helping to make
Ubuntu better. It sounds like some part of the system has crashed. To
help us find the cause of the crash please follow these steps:

1. Look in /var/crash for crash files and if found run:
    ubuntu-bug YOURFILE.crash
Then tell us the ID of the newly-created bug.

2. If step 1 failed then look at https://errors.ubuntu.com/user/ID where
ID is the content of file /var/lib/whoopsie/whoopsie-id on the machine.
Do you find any links to recent problems on that page? If so then please
send the links to us.

3. If step 2 also failed then apply the workaround from bug 994921,
reboot, reproduce the crash, and retry step 1.

Please take care to avoid attaching .crash files to bugs as we are
unable to process them as file attachments. It would also be a security
risk for yourself.

** Changed in: gnome-shell (Ubuntu)
       Status: New => Incomplete

-- 
You received this bug notification because you are a member of Desktop
Packages, which is subscribed to gnome-shell in Ubuntu.
https://bugs.launchpad.net/bugs/1891713

Title:
  I am unable to resize windows by clicking on the tops of them and
  dragging after gnome-shell restarted due to low performance.

Status in gnome-shell package in Ubuntu:
  Incomplete

Bug description:
  When I was saving a document, the computer froze, and so did the
  desktop, and mouse cursor.

  Eventually, the mouse cursor reset its position, and the screen
  flashed black but then back to normal. However, I was then unable to
  move windows around by clicking and dragging them. I had to manually
  minimize and then maximize the window back.

  This mostly happened to Visual Studio Code, which was running while I
  was saving data in another Java application.

  ProblemType: Bug
  DistroRelease: Ubuntu 20.04
  Package: gnome-shell 3.36.4-1ubuntu1~20.04.1
  ProcVersionSignature: Ubuntu 5.4.0-42.46-generic 5.4.44
  Uname: Linux 5.4.0-42-generic x86_64
  ApportVersion: 2.20.11-0ubuntu27.6
  Architecture: amd64
  CasperMD5CheckResult: skip
  CurrentDesktop: ubuntu:GNOME
  Date: Fri Aug 14 16:26:29 2020
  DisplayManager: gdm3
  InstallationDate: Installed on 2020-07-06 (39 days ago)
  InstallationMedia: Ubuntu 20.04 LTS "Focal Fossa" - Release amd64 (20200423)
  ProcEnviron:
   TERM=xterm-256color
   PATH=(custom, no user)
   XDG_RUNTIME_DIR=<set>
   LANG=en_US.UTF-8
   SHELL=/bin/bash
  RelatedPackageVersions: mutter-common 3.36.3-0ubuntu0.20.04.1
  SourcePackage: gnome-shell
  UpgradeStatus: No upgrade log present (probably fresh install)
  mtime.conffile..etc.apport.crashdb.conf: 2020-08-12T16:46:41.139091

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