We have an ASUS Black Knight Router RT-N66U with firmware version 188.8.131.52.374_720. It was running with dual bands in two frequencies, 2.4GHz and 5GHz, each with the same SSID.
However, one of the SSID's changed to a different SSID (the 2.4GHz frequency) without any changes by user, whereas the other SSID (the 5GHz frequency) stayed the same. They were both called ASUS, but the 2.4GHz frequency changed its name to
Can anyone give an explanation as to why and as how to prevent this from happening in the future?