We have also been experiencing the same issues. As you described AT&T has not been an issue for us and in some instances Verizon is okay. The only thing I can add is it appears to be geographic issue for us. In some locations Verizon in the MX67C-NA works without issue but in others it continually cycles. It will even connect long enough to establish a VPN before dropping again and the timing is very consistent with the cycles. Signal strength is great so no issues there but even where I have a poor signal in the geographic regions that don't experience the problem I don't get VPN drops or anything similar. Just some expected fluctuation in latency. I have spent quite a bit of time troubleshooting with both Verizon and Meraki with the same result you described. I have run through everything you described in troubleshooting steps as well with no luck. Would love to know if you have made any additional progress and will be happy to share if I come across anything helpful moving forward as well. This is critical for us as most of the locations we support do not have a good enough AT&T signal for them to be an option. Good luck!
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