At one of our client sites, an XG firewall works flawlessly most of the time, but every month or so it just stops working. You can't ping it, it stops routing traffic, just nothing. When you physically look at the firewall it looks fine and the activity lights blink. Every time I've tried to track down a cause, I haven't been able to find one. For example, in the system logs, those are normal up to the point where it stops functioning, and the logs don't resume until after a power cycle. I have most of the logging enabled so it should catch at least something. Any ideas to the cause of the freezing, or why nothing is caught in the logs?
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