Computer Model; Inspiron 1440
Wireless Adapter; Dell Wireless 1397 WLAN Mini-Card
Various Wireless Networks/Routers

I'm having an issue with wireless connectivity.

Whenever I load into WoW, after 5-10min of playing, the network adapter loses connection to any/all networks until restart. The problem is easily replicated.

This does not happen with any other program (including MANY steam games, browsers, etc) and my WoW installation is fresh with no addons.

I've gone through all the steps, relevant or not, offered by blizzard support, however the issue still remains. (this includes checking/changing power options, forwarding ports, driver and BIOS updates, even disabling the wireless switch) Is there any known issue incompatibility, or any further troubleshooting anyone can suggest to resolve this issue?

I'm certain this is an issue to do with either the dell WLAN card or some kind of service; as I've disabled the internal wireless adapter and used a USB wireless adapter and that had resolved the issue, however that is no longer an option.