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Thank you for the settings. Another temporary workaround for ESPCore 2.3 devices is to run your AP in NAT mode. I switched mine, upgraded to firmware 25.9 and my wireless device is still connecting.
Our MR18 has been set to "WPA2 Only" for quite some time. I tried upgrading the firmware to 25.9 and our TempStick immediately loses connectivity. Can you list the other settings on your device, such as how frequently it is checking in?