(I've been trying things for a few months with no solution. Since the day I got this netbook, got it up to speed with SP3 and Windows Update over and over, and with the proper drivers installed for its "Broadcom 802.11 b/g WLAN", I cannot figure this issue out.)
Most of the time, but not always, coming from standby, it has disconnected from the wireless router, and will never reconnect, until I reboot the computer (even rebooting the router and running "repair" on the wireless connection doesn't help.) Yet, I don't believe it has powered down, because it accurately can refresh the list of wireless routers available in my area. It just will never successfully connect--waits for a long time and then says it wasn't able. What could be wrong?