Hi all, I'm pretty new with DNN, so bew gentle if this questions is easily resolved, or resolved through an upgrade.  We are currently running DNN 4.5.3 on our site  We have set up automated XML emails with the scheduler to run every few days to newly registered members about our services.  There are 4 emails in total.  We have recently had members emailing us saying they have received 15 of the same email, but not all 4 emails we being sent over and over, just 2 of them.  I have checked the coding of the XML files and there doesn't appear to be any difference in the coding of one email to the next, other than the actual messaging in them. 

Are there any known issues with the scheduler, or are there resource son the internet available that would either validate my code or find new code to substitute a message an timing?  Would a DNN upgrade resolve these issues?  Thanks.