It sounds like to me the link is being overloaded and then packets get dropped.   have you tried prioritizing some of the traffic via traffic shaping / QoS.     ... View more

If you have only 1 lan port connected , you can make a packet capture of that port. Then load it in wireshark .  Most reliable is a monitor port in the switch ... View more

Opening ticket to the support and they confirm the cause of network down is because MX overload, the event dropped log is because of spike of traffic that not getting logged on MX utilization. Maybe its time to look for bigger firewall. ... View more