Completed request email not sending

[Zachar2]

Hi. I have a Gmail mailbox set up as a notifying service and all the emails are being sent fine except the ones with completed requests. Interesting thing is that it does happen eventually but only in the moment when I manually click the RC settings icon in my Plugins which results in just entering the settings. The second I do that, all stuck completed requests notifications are being sent at once. Any idea what might be causing that?