I use a ADSL route Speedtouch 413514 and my networkcard is a E-Tech USB WLAN(Ralink2500 I think) and when it happens I go to the Networkmanager and let it scan ,he don't find my router ...he find nothing,because I live in a appartment and normally he find several routers...and the only thing I can do is restart my computer.
Hmm, it looks like ralink drivers are buggy. I'd try ndiswrapper in that case:
* uninstall ralink drivers from package-manager
* install your usb stick's windows drivers using ndsiwrapper:
http://en.pardus-wiki.org/Using_Windows_wireless_card_driversYou should use
modprobe -r modulename command as root to unload your current drivers or just restart the system after uninstalling the drivers from package manager. (
lsmod command lists currently used drivers and that helps you get the modulename in that case)