DNS is offsite, but this has never been an issue in the past. DHCP is also offsite, but again that would only be an issue with a device connecting for the first time. The network stack is full Meraki with the exception of a Cisco 2811 ISR which we use as a H.323 gateway for external lines. We have run this setup for some time now, and in the past we've had no issues. In the last 4 weeks or so we've started getting reports of everything going belly up. I had the location in the topology below unplug their Cable Modem and see if anything worked. Nothing worked, and I had 2 other locations have the same issue. Two had MX67C and One an MX84, one MX67C and the MX84 are running firmware 14.40 and the other MX67C 14.50. One has a SIM chip installed but doesn't seem to have failed over. Packet loss was high, but doesn't look like it was enough to force the change looking at the history, nor did I receive a notification of the fail over. Switches are MS 220's 24 or 48 ports, and AP's are all MR33's Don't know if this is beneficial, but it popped up in locations that have had no changed in hardware or design recently. It's possible it's a firmware bug, but seems like one that would get a lot of attention really fast as well. Uncertain what the issue could ultimately be.
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