kong 22000++ cannot turn radio back on with "wl radio on"

Hi;

My Setup:
Router: Cisco Linksys E1200 V2
Firmware: Kong 22000++ vpn version (DD-WRT v24-sp2 (06/07/14) vpnkong - build 22000M)
The file I used for upgrading:
usb-ftp-samba3-vpn-nv64k-broadcom.bin
(from http://www.desipro.de/ddwrt/K26/r22000++/usb-ftp-samba3-vpn-nv64k-broadc...)

The Problem:
I cannot turn wireless radio back on (after turning it off) via ssh (or the commands section in web gui) using 'wl radio on' command, here is what happens:

root@DD-WRT:~# wl radio
0x0000
root@DD-WRT:~# wl radio off
root@DD-WRT:~# wl radio
0x0005
root@DD-WRT:~# wl radio on
root@DD-WRT:~# wl radio
0x0004

More info & things I've tried:
'wl up' & 'wl restart' don't seem to make any difference. The status in the web gui says that the radio is on, but I cannot see the SSID on my wireless devices.
In this state, the radio turns on and 'wl radio' returns '0x0000' if I do any of the following:
1) Opening the wireless site survey window through web gui (status > wirless > site survey)
2) Reboot
3) Power cycle
4) Disabling & enabling wireless through web gui by using 'wireless network mode' drop down menu (wireless > basic settings > wireless network mode)
After any of these, if I use ssh commands, I get the same problem again.

Surprisingly, if I open the 'wiviz survey' window via web gui (status > wirless > wiviz survey) & keep it open, the radio turns on and the ssh commands work fine, as you see:

root@DD-WRT:~# wl radio
0x0000
root@DD-WRT:~# wl radio off
root@DD-WRT:~# wl radio
0x0001
root@DD-WRT:~# wl radio on
root@DD-WRT:~# wl radio
0x0000

But as soon as I close the wiviz survey, ssh commands run into problems again.

Doing a 30-30-30 reset followed by a power cycle fixes the situation as well (radio turns on & the ssh commands work as expected), but the problem comes back again when I start to configure my router the way I want it (setting up the open vpn, assigning static ip for wan, changing router ip ...)

Any help will be appreciated, thanks.