When you configure a dual band AP with a single SSID , the client device decides the best frequency band to be used.
Very often 2.4GHz band is chosen , resulting in worse bandwidth /speed experience due to a lower 802.11 standard.
So likely a gigabit ISp connectivity is brought down to few tens Mb wireless speed, despite AX mode is available for 5GHz radio.
How to manage this ?
Is it better to split SSID name for different radio bands ?
Or disable old 2.4GHz band ?
Perhaps enable only 802.11ax mode in 2.4GHz band ?
Thanks