We have same issue with MG21. By all appearances, anywhere between 21-25 days goes dark. Needs rebooted to come back. Looking for way to connect to switchport, so need to drive into offices to reboot. On the MX port 1 is internet and port 2 is cellular (non POE). Nightmare reaching out to people at 6 different sites to go in and reboot. Opened case with Meraki, not helpful at all.
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