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Unexplained reboots for Firepower 2100

After a long period of pretty stable operation, we have been experiencing semi-random outages for our WAN and after a brief suspicion of the external network connection are fairly certain our Firepower is actually the cause of the outage and just determined that it has in fact been rebooting itself.   It appears to happen after about 2 days of operation.   The web interface shows very little useful so getting more familiar with CLI.  A few questions

 

1) what is the best way to determine cause of reboot or symptoms?  (I have only seen uptime so far and it's short enough to explain the outage)

2) any ideas what might cause that pattern (the reboots are almost exactly (not quite)) 2 days apart so far, so it looks semi systematic..  Otherwise device looks happy - low cpu, plenty of disk space, not terribly loaded.   Any thoughts appreciated and I suspect I'm about to get a crash course in the cli commands which is fine