Netgear wg311 problems

running a wg311 with latest drivers and a netgear router. When the card is working the internet is decent; however, if I need to restart or reboot the computer suddenly does not recognize the card, and I may need to shut down completely and reboot 5-10 times before it recognizes the card and connects to the wireless router again. I am running Vista and considering getting another card since it is obviously not the router, but am frustrated that it can work for days and days until I have to reboot. Any ideas? Is this a documented problem? I've tried switching the slots on the mobo with no luck. Thanks in advance for any help!