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I'm just looking at connectivity at the summary pageSecurity & SD-WAN - Appliance Status - summary - Connectivity graph. That shows when the last reboot was, as the MX disconnected from the dashboard.
Disable Intrusion detection and prevention stops the reboots. It is not a great solution, but Firewall rebooting is worse. // So far, uptime of 20 min with Intrusion detection and prevention disabled.