Hi Henry,
I request you to open a case with our support team and point them the bug ID "NUTM-2131". As there was no duplicate instance reported from other customers the ID was rejected a solution.
Thanks
Sachin Gurung
Team Lead | Sophos Technical Support
Knowledge Base | @SophosSupport | Video tutorials
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I am having this same problem since this weekend, 5/14/17
Firmware version: 9.413-4
Pattern version: 125899