Yep, you hear it right - whenever I'm in game my WiFI (Asus RT-N16) shuts down, proven on 2 notebooks and few other devices.

It's enough for me to just minimize (!!!) the game to make wireless work again, but then, returning into game shuts it off another time.

Do you have any ideas how this can be caused? Where to start some research? Apparently google has nothing for me...

I've got Win 7 64 bit if it's somehow related.

Nobody any idea? :(

It happens first time in my life, never encouraged such a problem. And it only occurs while playing Arcanum. (How can a game even communicate with a router, since it's an external device?!)

Oh wow, that is a really odd problem. Only similar thing I heard of was a canon network printer getting a router to reboot when the printer was turned on.
I assume that you verified that the WiFi of your router shuts down, not the WiFi card of your notebook.
Are you connected to the router by LAN cable when this happens, or just WiFi?