Factory reset has made no difference whatsoever.
The SSID names all include ASCII characters and character length is less than 12.

Any more ideas?

@cas here you go

BusyBox v1.25.1 () built-in shell (ash)

---

/ __ ___ ()__ ___ / __ _ _ ___ ___ ____ _
/ // / _ / / _ / _ \ / // / ' / -) _ / _ /
_/////___//// _////_/_, /_,/
W H A T W I L L Y O U I N V E N T ? /__/

Ω-ware: 0.2.1 b199

root@Omega-EB51:~# wifisetup
Onion Omega Wifi Setup

Select from the following:

1. Scan for Wifi networks
2. Type network info
   q) Exit

Selection: 1
Scanning for wifi networks...

Select Wifi network:

1. [hidden]
2. [hidden]
3. Volumio
4. [hidden]
5. [hidden]

Selection: ^C
root@Omega-EB51:~# iwconfig
lo no wireless extensions.

ra0 RTWIFI SoftAP ESSID:"Omega-EB51"
Mode:Managed Channel=10 Access Point: 40:A3:6B:C2:EB:51
Bit Rate=150 Mb/s

eth0 no wireless extensions.

br-wlan no wireless extensions.

apcli0 RTWIFI SoftAP ESSID:""
Mode:Managed Channel=10 Access Point: Not-Associated
Bit Rate:150 Mb/s

root@Omega-EB51:~# ifconfig
apcli0 Link encap:Ethernet HWaddr 40:A3:6B:C2:EB:52
inet6 addr: fe80::42a3:6bff:fec2:eb52/64 Scope:Link
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:0 errors:0 dropped:0 overruns:0 frame:0
TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:0 (0.0 B) TX bytes:0 (0.0 B)

br-wlan Link encap:Ethernet HWaddr 40:A3:6B:C2:EB:51
inet addr:192.168.3.1 Bcast:192.168.3.255 Mask:255.255.255.0
inet6 addr: fd1d:48c4:7633::1/60 Scope:Global
inet6 addr: fe80::42a3:6bff:fec2:eb51/64 Scope:Link
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:186346 errors:0 dropped:0 overruns:0 frame:0
TX packets:179832 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:13758954 (13.1 MiB) TX bytes:15803494 (15.0 MiB)

eth0 Link encap:Ethernet HWaddr 40:A3:6B:C2:EB:52
inet6 addr: fe80::42a3:6bff:fec2:eb52/64 Scope:Link
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:0 errors:0 dropped:0 overruns:0 frame:0
TX packets:1402 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:0 (0.0 B) TX bytes:476840 (465.6 KiB)
Interrupt:5

lo Link encap:Local Loopback
inet addr:127.0.0.1 Mask:255.0.0.0
inet6 addr: ::1/128 Scope:Host
UP LOOPBACK RUNNING MTU:65536 Metric:1
RX packets:6573 errors:0 dropped:0 overruns:0 frame:0
TX packets:6573 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1
RX bytes:400816 (391.4 KiB) TX bytes:400816 (391.4 KiB)

ra0 Link encap:Ethernet HWaddr 40:A3:6B:C2:EB:51
inet6 addr: fe80::42a3:6bff:fec2:eb51/64 Scope:Link
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:192982 errors:7 dropped:0 overruns:0 frame:0
TX packets:178813 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:20338723 (19.3 MiB) TX bytes:13207291 (12.5 MiB)
Interrupt:6

root@Omega-EB51:~# ifconfig apcli0
apcli0 Link encap:Ethernet HWaddr 40:A3:6B:C2:EB:52
inet6 addr: fe80::42a3:6bff:fec2:eb52/64 Scope:Link
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:0 errors:0 dropped:0 overruns:0 frame:0
TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:0 (0.0 B) TX bytes:0 (0.0 B)

root@Omega-EB51:~# logread | grep ap_client
Thu Oct 18 20:48:23 2018 kern.info ap_client: 'apcli0' assoc: no, mac: 00:00:00:00:00:00
Thu Oct 18 20:48:23 2018 kern.info ap_client: Scanning for networks...
Thu Oct 18 20:48:25 2018 kern.info ap_client: network 0: 4 Volumio b8:27:eb:1f:b4:d8 WPA2PSK (AES) -60
Thu Oct 18 20:48:25 2018 kern.info ap_client: network 1: 1 e6:cb:bc:49:f7:22 WPA2PSK (AES) -67
Thu Oct 18 20:48:25 2018 kern.info ap_client: network 2: 1 e0:cb:bc:49:f7:22 WPA2PSK (AES) -68
Thu Oct 18 20:48:25 2018 kern.info ap_client: network 3: 6 e6:cb:bc:49:fa:15 WPA2PSK (AES) -71
Thu Oct 18 20:48:25 2018 kern.info ap_client: network 4: 11 e0:cb:bc:49:ff:91 WPA2PSK (AES) -82
Thu Oct 18 20:48:25 2018 kern.info ap_client: network 5: 11 e6:cb:bc:49:ff:91 WPA2PSK (AES) -82
Thu Oct 18 20:48:25 2018 kern.info ap_client: no configured networks found in the site survey
Thu Oct 18 20:48:33 2018 kern.info ap_client: 'apcli0' assoc: no, mac: 00:00:00:00:00:00
Thu Oct 18 20:48:33 2018 kern.info ap_client: Scanning for networks...
<snip snip>

root@Omega-EB51:~# wifisetup debug
Collected WiFi and network debug information in /tmp/wifidebug.log file
root@Omega-EB51:~# cat /tmp/wifidebug.log
================ WIFI DEBUG LOG ================
== Thu Oct 18 21:04:10 GMT 2018 ==

================ ifconfig ================
apcli0 Link encap:Ethernet HWaddr 40:A3:6B:C2:EB:52
inet6 addr: fe80::42a3:6bff:fec2:eb52/64 Scope:Link
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:0 errors:0 dropped:0 overruns:0 frame:0
TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:0 (0.0 B) TX bytes:0 (0.0 B)

br-wlan Link encap:Ethernet HWaddr 40:A3:6B:C2:EB:51
inet addr:192.168.3.1 Bcast:192.168.3.255 Mask:255.255.255.0
inet6 addr: fd1d:48c4:7633::1/60 Scope:Global
inet6 addr: fe80::42a3:6bff:fec2:eb51/64 Scope:Link
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:199101 errors:0 dropped:0 overruns:0 frame:0
TX packets:192284 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:14683554 (14.0 MiB) TX bytes:16997787 (16.2 MiB)

eth0 Link encap:Ethernet HWaddr 40:A3:6B:C2:EB:52
inet6 addr: fe80::42a3:6bff:fec2:eb52/64 Scope:Link
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:0 errors:0 dropped:0 overruns:0 frame:0
TX packets:1457 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:0 (0.0 B) TX bytes:495650 (484.0 KiB)
Interrupt:5

lo Link encap:Local Loopback
inet addr:127.0.0.1 Mask:255.0.0.0
inet6 addr: ::1/128 Scope:Host
UP LOOPBACK RUNNING MTU:65536 Metric:1
RX packets:6837 errors:0 dropped:0 overruns:0 frame:0
TX packets:6837 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1
RX bytes:416920 (407.1 KiB) TX bytes:416920 (407.1 KiB)

ra0 Link encap:Ethernet HWaddr 40:A3:6B:C2:EB:51
inet6 addr: fe80::42a3:6bff:fec2:eb51/64 Scope:Link
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:206149 errors:7 dropped:0 overruns:0 frame:0
TX packets:191192 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:21708795 (20.7 MiB) TX bytes:14221423 (13.5 MiB)
Interrupt:6

================ iwconfig ================
lo no wireless extensions.

ra0 RTWIFI SoftAP ESSID:"Omega-EB51"
eth0 no wireless extensions.

br-wlan no wireless extensions.

      Mode:Managed  Channel=10  Access Point: 40:A3:6B:C2:EB:51   
      Bit Rate=150 Mb/s   

apcli0 RTWIFI SoftAP ESSID:""
Mode:Managed Channel=10 Access Point: Not-Associated
Bit Rate:150 Mb/s

================ uci show wireless ================
wireless.radio0=wifi-device
wireless.radio0.type='ralink'
wireless.radio0.variant='mt7628'
wireless.radio0.country='US'
wireless.radio0.hwmode='11g'
wireless.radio0.htmode='HT40'
wireless.radio0.channel='auto'
wireless.radio0.disabled='0'
wireless.radio0.device_mode='apsta'
wireless.radio0.op_mode='preference'
wireless.ap=wifi-iface
wireless.ap.device='radio0'
wireless.ap.mode='ap'
wireless.ap.network='wlan'
wireless.ap.ifname='ra0'
wireless.ap.encryption='psk2'
wireless.ap.key='12345678'
wireless.ap.disabled='0'
wireless.ap.ssid='Omega-EB51'
wireless.sta=wifi-iface
wireless.sta.device='radio0'
wireless.sta.mode='sta'
wireless.sta.ifname='apcli0'
wireless.sta.encryption='psk2'
wireless.sta.ssid='YourSsidHere'
wireless.sta.key='YourPasswordHere'
wireless.sta.network='wwan'
wireless.sta.disabled='0'
wireless.@wifi-config[0]=wifi-config
wireless.@wifi-config[0].key='0SL3R2017'
wireless.@wifi-config[0].ssid='OslerWifi'
wireless.@wifi-config[0].encryption='psk2'

root@Omega-EB51:~#