Once a week or so one of my remote Nvidia Managed Profit Miner rigs locks up and requires a reboot. I only get notifications for the rig being offline maybe once out of every ten times it does this. Am I missing something in the configuration? All my email tests through Gmail work without issue. How do I troubleshoot something like this is there a log to review?

Here is my rules...just the default. Rig has been offline for 8 hours with no email received.

https://imgur.com/a/NjXz9

Example Offline detection email I've successfully received before:

CS - MP Miner 1: Offline detection
Awesome Miner
Fri 1/5/2018, 2:47 PM
Miner offline