Since I have installed on the Dlink2640 the 23.05.x I noticed a strange effect on the wifi 5GHz (MediaTek MT7615E 802.11ac/n).
If I change the country, channel, power or bandwidth, I get that only the main wifi 5GHz works, while for all the other wifi 5 GHz I defined returns error of "wireless not associated".
I also noticed that, if I keep everything at default and I enable the 160 MHz channels, after 5-10 min, the wifi disappear and I get again the same issue.
This was not working with the 22.03.x, so I guess it's a matter of drivers. Is there any log I can share to help diagnosing the issue?
This is what I see (I tried with Canada as country, just as example)
So better read this 1st and see: The 22.03.3 Stable release appears to have least amount of problems as of January 2023. But, expect a loss in routing performance since it does not include arinc9's patches.
Conclusion: There are some issues regarding 5GHz Wifi, so better stay on 22.03.3
Ive also experienced 5ghz not working on 23.05.2 on my pi4 using a mediatek mt7612u dongle. 5ghz works well on 22.03.5. This is in STA mode, i have not tested ap mode.
I made multiple trials and I finally made it working (on the 80MHz). I had to select the channel 149, so that I can set the 24 dBm (the maximum of the router).
I did a quick test on a DIR-2640 rev.A1 running stable release 23.05.0; several weeks? ago and did not encounter any issue during the three days I had it available to me.
Packages included were irqbalance, banip and adblock.
With that said,
I did not try WPA3 but configured with WPA2-PSK (AES) and due to high wifi density in the city, did not bother with 160 channel width and instead kept it at 80.