Over the weekend I upgraded from 4.2.1 to the full 4.4.1 and then the patch for 4.4.2. The next day the system sent out emails to every customer that ever opened a ticket, advising it would be auto-closed since there wasn't a response in the last 72 hours. I should point out all these tickets were closed and had been closed for quite a while. I figured it was a one-off problem due to the settings change, but it did it again this morning, sending the same email for the same tickets as the day before.
Any ideas?