These files do not exist. Don't you mean:
/var/lib/gconf/system/osso/connectivity/IAP/&gconf.xml
instead?

here there is an entry "timeout_wlan" with a value of 0 (zero).

If you mean to test the Wlan hardware values, these appear to be under /sys/devices/platform/wlan-omap



Still, I do not think that you are looking in the right direction. I would rather believe that the router resets when there is a problem with the firewall or port settings. With mine, it only reset when I tried that sip video connection, and sip tends to be relatively aggressive in opening tcp/udp ports. Torrent clients are also relatively aggressive in this respect and use of torrent is the main difference between your setting and mine. Keep in mind that the Apple router does not use upnp for its port settings, but bonjour.