You mean they stop working after any configuration change or you made a specific change and this has been happening since? Have you tried undoing the change? What was the change? If you aren't on the latest firmware, I definitely suggest that. I don't see any known issues or fixes even going back a bit, but Meraki doesn't always list every bug. If that doesn't help, you could try a factory reset to see if it resolves the issue. Something may be gummed up on the config on the device. Alternatively or if that fails, give support a ring when one of them isn't working. They can hopefully identify the issue and open a bug if necessary.
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