We own 3 Asus laptops. Within 2 years, the Wi-Fi stopped working on them. On one, ,we bought a plug-in part that connects to WiFi, but it won't work on the other 2. A repair shop says it is probably a problem on the motherboard and would be very expensive to fix. So frustrating. Has anyone had success with the ASUS company fixing this on a 2 year old laptop?