Password Reminder Notification has sending errors

Password Reminder Notification has sending errors

I send email password expiration warnings every morning. Recently I have been getting error "432 4.3.2 STOREDRV.Storage; mailbox server is too busy; STOREDRV.Submisson.Exception:StorageTransientException.MapiExceptionRpcServerTooBusy; Failed to process message due to a transient exception with message Cannot open mailbox." randomly in my report.

Has anyone else ran into this? I am using Office365 to send notification.
Thanks,

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