It will be difficult to try to reproduce this problem here, with
multiple domains interconnected like that.

Did you start experiencing this problem recently, after some update, or
has it always been like this?

I see this remark in the winbindd manpage:
       SIGHUP
           Reload the smb.conf(5) file and apply any parameter changes to the 
running version
           of winbindd. This signal also clears any cached user and group 
information. The
           list of other domains trusted by winbindd is also reloaded.

That's what is used for log rotation. I suspect in your case that cache
that is erased plays a big role in winbindd's performance. Note how it
also reconnects to all trusted domains after this signal.

Have you tried setting winbind max domain connections to a value higher
than 1?

Does winbind ever recover itself from the reload effects after a while,
or only after a restart?

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https://bugs.launchpad.net/bugs/1960821

Title:
  Winbind can no more connect to Windows domain after reload

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