5 GHz for me is perfect 
My notebook adapter speed is max 433 Mbps for 5GHz
@nbd
Is it normal that with 2.4 GHz I can not get 40MHz channel width anymore?
The configuration has not been changed, LuCI says that devices are connected with 40 MHz but my Intel AC 3165 (Driver 19.51.8.2) and Honor 6X only gets 20 MHz width.
With previous version (r5433) i have always 40 MHz channel width with 2.4 GHz
Thanks