The wireless LAN connection drops frequently or is unstable? What can I do?
The reason of those kind of problems could be caused by the structural conditions (distance to the router and the thickness of the walls / ceilings) or other "sparking devices" such as other wireless devices, Bluetooth devices, baby monitors, mobile phones, microwaves which could be affect the quality of the wireless connection.
In these cases, you can try to avoid the interference by manually setting the WLAN channel at your WLAN router. The precise procedure for changing the WLAN channel can be found in the operating manual of the router.