Thank you for your reply. I'm located in Malta (Europe).
Currently, the router is used for cooperation of the media system components (Ipad, projector, Blu-ray player, RTI processor, sound system, etc) and isn't connected to the Internet.
I tried to change the various wireless network settings, as you suggested, but it didn't help, the wireless radio remains constantly OFF.
Now, I'll try to update the firmware to see if it can solve the problem.
Thanks and regards.