I made the mistake of running /interface wireless frequency-monitor on the interface I was coming in through.
Of course my ssh connection immediately hung.
I reconnected via a hardline and found the interface was marked as “not disabled but not running” and registration-table showed zero users. There was nothing in the details shown by /int wireless print to indicate that anything was amiss with the interface. In hopes of resetting the interface, I ran /int wireless frequency-monitor again and got results, then quit, but this did not re-enable the interface. Finally, I just rebooted the router and all the interfaces came up fine.
What SHOULD I have done to reset this interface back to working order?