Sometimes Pc Cannot Find Perfectly Working Wirelss

O.s. win 7 ultimate 7100 32-bit.I have a wireless connection set up at home that works perfectly, however sometimes my win 7 netbook cannot find the wireless network anymore.this is annoying since i didn't install new drivers, didn't change a thing and besides, my android phone and another xp computer connect without problems.i tried to restart the windows wireless auto-configuration service as well, turn on/off the wireless or remove the saved wireless network.of course in the router properties, i enabled broadcast of network ID and it's not hidden.the only things that work are either:

1) rebooting the router, after that finds network OK
2) restarting only the WLAN connection, after that finds network OK
3) removing the battery sometimes fixes the problem without 1 or 2
4) shutting down and leaving the pc to rest 5 minutes sometimes fixes the problem without 1 or 2

this is very odd, i upgraded wireless drivers to the latest. i have an Asus n10J 1.6ghz overclocked to 2.1ghz and network card is Atheros 928X.oh and by the way in the network properties i enabled "connect even if network is not broadcasting its name SSID" // which clearly is not working even if the router wouldn't broadcast it for good.i start to think that it's a bug in the network card hardware or driver.