Quarantine Digest Email - Multiple Emails Sent

Hi, 

I have a really strange issue were SMTP quarantine on XG Home sends the quarantine digest email many times.

I have the email configured to send once a day at 10:00 using an internal mail server.

At the moment I receive 18 copies of the mail. Sometimes they go in my junk mail folder, other times not, but that's a separate issue.

I've tried disabling quarantine digest emails and re enabling but this seems to make the problem worse and the number of mails goes up!

I'm guessing there is a config file somewhere and entries are being duplicated rather than amended, but I can't see anything obvious. 

I have verified and the mail server does receive the email 18 times, so it's definitely XG sending multiple times, rather than a mail server issue.

Any one seen this issue before and have any suggestions?

Thanks.