@maratsade What I was going to recommend was: 1. make sure all of the settings are precisely back were they were. Make sure the 20/40MHz thing is back to 20MHz (if it was that way), as well as the 802.11n-only back to whatever it was for 2.4GHz. Ditto for the 5GHz. 2. Temporarily turn off the wifi for any devices that might be trying to connect to either the 2.4 or 5GHz wifis. 3. Do a complete power reset: Unplug the connector from the modem's power brick and let it sit for about a minute, then reconnect it. 4. Let the modem reboot, and wait about 5' afterwards to let the wifi's settle. 5. Once the wifis settle and the wifi light has been lit for a reasonable amount of time, start connecting things back one-by-one. One of the reasons I used thing the 5GHz used to crash on reboot was it went into connection overload, making it unstable (I used to have a LOT of stuff hung off these wifis). So when all the computers, phones, printers, etc started to negotiate it probably felt like a NYC traffic cop standing in the middle of Times Square. Maybe this fixes it... fingers crossed... and sorry again (for both things, now 😔).
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