Can not connect to wifi

appas

Hi,
I have a Raspberry Pi 3 B+ running Retropie 4.7.20. Until recently, everything was working fine, but now, I can't connect to Wifi!
On boot, I get [FAILED] messages for dhcpd and the Raise network intefaces steps.

I have tried editing the /etc/network/interfaces file, and indeed, the configuration for my AP is there.
I have tried making separate SSIDs for the 2.4 and 5 GHz bands in my router config, then connecting to each in turn - neither works with the Pi (other devices are able to connect to both).
I have verified Wifi is not blocked by rfkill.
I have set the Wifi locale country, and, again, this was working before. Because it was suggested in another thread dealing with a similar issue, I tried setting it to a different value, booting, then setting it back and booting again. This did not help.
I also tried importing Wifi settings (for both the 2.4 and the 5 GHz SSID) with wifikeyfile.txt. This did not work.
The Pi can see both SSIDs in the AP list - but it fails to connect, even though the password is correct (works with other devices). The Wifi security is WPA2/PSK, and this was working previously.

Edit: Running wpa_supplicant -c /etc/wpa_supplicant/wpa_supplicant.conf -i wlan0 gives me
"CTRL-EVENT-ASSOC-REJECT bssid-[mac here]

I also tried the kernel module options from here, but it did not work.

appas

I tried disabling WMM in my router because it was suggested in another thread, but that did not help.

appas

Well, now it works again.

appas

It happened again, and this time, I found this answer, which helped. In other words, I did

rmmod brcmfmac 
modprobe brcmfmac roamoff=1 feature_disable=0x82000

And then wpa_supplicant as normal, and it connected.

appas

This fix did not survive a reboot, so I added modules-load=brcmfmac roamoff=1 feature_disable=0x82000 into /boot/cmdline.txt and it seems to work.