I think I have this problem too.
I also have this in my session log:

oct. 29 12:06:20 sark org.gnome.Shell.desktop[6838]: == Stack trace for context 
0x55f6851611c0 ==
oct. 29 12:06:20 sark org.gnome.Shell.desktop[6838]: #0   7ffc4b206740 b   
resource:///org/gnome/gjs/modules/overrides/GObject.js:468 (7fd1489cc040 @ 25)
oct. 29 12:06:20 sark org.gnome.Shell.desktop[6838]: #1   55f697d100f0 i   
/usr/share/gnome-shell/extensions/ubuntu-d...@ubuntu.com/theming.js:416 
(7fd116ba3dc0 @ 20)
oct. 29 12:06:20 sark org.gnome.Shell.desktop[6838]: #2   7ffc4b2076e0 b   
self-hosted:261 (7fd1489c1dc0 @ 223)
oct. 29 12:06:20 sark org.gnome.Shell.desktop[6838]: #3   55f697d10038 i   
/usr/share/gnome-shell/extensions/ubuntu-d...@ubuntu.com/theming.js:415 
(7fd116ba3d30 @ 172)
oct. 29 12:06:20 sark org.gnome.Shell.desktop[6838]: #4   7ffc4b2087f0 b   
resource:///org/gnome/gjs/modules/_legacy.js:82 (7fd1489b0b80 @ 71)
oct. 29 12:06:20 sark org.gnome.Shell.desktop[6838]: #5   55f697d0ff58 i   
/usr/share/gnome-shell/extensions/ubuntu-d...@ubuntu.com/theming.js:235 
(7fd116ba39d0 @ 102)
oct. 29 12:06:20 sark org.gnome.Shell.desktop[6838]: #6   7ffc4b209760 b   
resource:///org/gnome/gjs/modules/_legacy.js:82 (7fd1489b0b80 @ 71)
..........

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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/1800477

Title:
  Extensions are disabled after unlocking the screen

Status in gnome-shell package in Ubuntu:
  Confirmed

Bug description:
  Quite often all the extension (excepted the dock) are disabled after
  unlocking the screen.

  ProblemType: Bug
  DistroRelease: Ubuntu 18.10
  Package: gnome-shell 3.30.1-2ubuntu1
  ProcVersionSignature: Ubuntu 4.18.0-10.11-generic 4.18.12
  Uname: Linux 4.18.0-10-generic x86_64
  ApportVersion: 2.20.10-0ubuntu13
  Architecture: amd64
  CurrentDesktop: ubuntu:GNOME
  Date: Mon Oct 29 15:00:52 2018
  DisplayManager: gdm3
  InstallationDate: Installed on 2014-07-15 (1567 days ago)
  InstallationMedia: Ubuntu 14.10 "Utopic Unicorn" - Alpha amd64 (20140520)
  SourcePackage: gnome-shell
  UpgradeStatus: Upgraded to cosmic on 2018-03-24 (218 days ago)

To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/gnome-shell/+bug/1800477/+subscriptions

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