its uncanny but we are having what seems to be the exact same issue with our Meraki and Fortigate. Below is our setup, but essentially we see the same sort of messages in our MX95, it looses connection to our Fortigate and as a result all our spoke sites go down and headoffice looses internet connectivity. Been going on since Oct 12th, with about 5 flaps a day lasting about 30 seconds each, then it comes up on its own. when it occurs fortigate is unable to ping mx95 but the fortigate itself still has internet access. laptop plugged directly into a lan port on the MX95 is not able to ping the mx95 or 8.8.8.8 when the outage occurs but is able to ping the fortigate Have you solved your problem yet?
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