How do I turn off Pro Sites expiration notification emails for monthly subscribers?

My Pro Sites users are getting two email notices when their subscription is expiring. And they get another email the 30 minutes later saying payment has been successful and the subscription has renewed. Shouldn't it just automatically renew if they are monthly? Is there a way to turn off the expiring notification? It seems like a good feature to notify of expiration for annual subscribers, but it's really annoying for monthly subscribers. Is there a way to just make it automatically renew without the notification? I do have the recurring subscriptions option enabled in the settings.