BB Black Ethernet or Green Wireless WiFi not reliable

General Discussion
1

I have multiple BBGWs all provisioned from bone-eMMC-flasher-debian-10.3-iot-armhf-2020-04-06-4gb.img.xz image.
After clean emmc flash, I can connect to my WPA2-PSK wifi using connman.
When I power cycle the BBs, almost always wifi does not reconnect, ip reports:
4: wlan0: <NO-CARRIER,BROADCAST,MULTICAST,DYNAMIC,UP> mtu 1500 qdisc mq state DOWN group default qlen 1000
Connman sequence “disable wifi” → “enable wifi” → “scan wifi” often reconnects wifi, but sometimes after multiple tries.
Sometimes, wifi is connected after the boot but it drops and does not reconnect back.
Last wl entry in the log when wifi is not connected is:

Dec 07 04:17:17 beaglebone kernel: wlan0: send auth to 24:5a:4c:xx:xx:xx (try 1/3)
Dec 07 04:17:17 beaglebone kernel: wlan0: send auth to 24:5a:4c:xx:xx:xx (try 2/3)
Dec 07 04:17:17 beaglebone kernel: wlan0: send auth to 24:5a:4c:xx:xx:xx (try 3/3)
Dec 07 04:17:17 beaglebone kernel: wlan0: authentication with 24:5a:4c:xx:xx:xx timed out

I have an Unifi network with multiple APs all running the same network.
So far I tried:

  1. Fresh image
  2. Disabled tether and Bluetooth
  3. Updated kernel and all packages
    So far no success, wifi does not reliably come up.
    What am I missing?
2

maybe that’s why, UniFi OS UDM 1.12.33 also here with lots of AP’s… While regression testing Buster/Connman it’s never auto-connects anymore… With Bullseye we use wpa_supplicant & systemd-network, things seem to work better…

Regards,