Slow speeds after power outages

[psikofunkster]

Hello,

Could somebody please explain me why this happens?

I have almost 1gb wireless speeds via wifi but when a power outage happens (here is frequently) the speeds go down to 150mb perhaps 200mb.

I have separate SSID for my 2.4 and 5ghz bands, i've never connect to the 2.4 band after the power outage, its the 5ghz one that is giving me slow speeds.

I have a RT-AX86U router with firmware updated.

I was using WPA2/WPA3 but that didn't fix the issue. Today i changed to WPA3 exclusively.

Is there a parameter i can modify to avoid this?

I assume my issue is related to channels, i have them on auto, guess i should disable that and only use 160mhz ones...

[jzchen]

After a power outage the router is probably scanning DFS channels prior to opening the higher bandwidth.  These channels as I understand are used by aeronotics/airplanes which have priority over land WiFi.  Scanning can be enforced for 1 minute or 10 minutes and the router will not function to it's full potential until it verifies nothing is using these airplane frequencies.  (I'm not sure if it can distinguish between an airplane/airport and a neighbor's router to be completely honest.  This is specifically in the 5 GHz realm.)