To add to the answer of @MerakiDave . That sequence of intrusion detection log messages is a known issue that is supposed to be solved in firmware version 14.31 according to this topic: https://community.meraki.com/t5/Security-SD-WAN/Intrusion-Detection-Error-Log/td-p/20568 But as far as I can see the stable releases are still on 13.36. If it bothers you you can upgrade to the newer firmware from Organization > Firmware Upgrades and then going to the All networks tab. Find your MX, select it, and click the Schedule upgrades button.
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