SK
If your site uses automatic client upgrade, when you update the site to version 1910, all clients immediately upgrade after the site updates successfully. The only randomization is when clients receive the policy, which by default is every hour. For a large site with many clients, this behavior can consume a significant amount of network traffic and stress distribution points.
+To work around this issue, temporarily disable automatic client upgrade. Use other client upgrade methods. Microsoft will soon release a hotfix for this issue to allow you to continue to use automatic client upgrade.