Very Strange problem with internal Lan Atheros AR8131 PCI-E

[Syndicator]

i can stay connected when i just browse the internet or play a game that uses the internet like a MMORPG but once i go into a full screen game like Mass Effect 2 or like Dragon age the lan gets disconnected after 15 mins and i have to completely restart the computer to get connected again.

[PcTestCard.com]

Try reset Bios default, reinstall the chipset driver, reboot to take effect.
Then reinstall the LAN Driver.

Check the game settings if needed.

Hope this helps.
Bill
Tech manager