I have a policy in place for some Windows 2012 R2 servers to auto install updates and reboot on a Saturday morning. They seem to ignore this schedule and reboot the evening/early morning after I approve the updates.

My guess is that it might be the “Install during automatic maintenance” setting being enabled? Does that override a schedule?

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Do you have the latest GPOs? There was a setting introduced in Server 2012 R2 that basically said "Restart right now’ after updates were installed.

Something like "Restarting in 15 minutes" Automatic Updates Server 2012

EDIT:

See solution here. “Always restart at scheduled time”

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I’ve updated AD with the 1807 GPO so I assume that we are on the latest version (certainly later than the server version) - I note the best answer in other post is to have the maintenance window UNTICKED, other settings were as per my current ones.

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Yeah, that setting would definitely get overwritten.