Because the problem occurs on your Vaio laptop, I'd start with the settings on your Vaio and the Linksys NIC that you are using there. If you have another laptop (or can borrow one from a colleague or friend), try the Linksys NIC there. Ideally, that laptop should be running the same operating system so that you can completely eliminate (or prove) the NIC as the culprit.
If you encounter the same problem using that NIC on another laptop, then you'll want to look for firmware and client software updates for your NIC and try reconfiguring adapter-level settings.
If you don't encounter the same problems on another laptop, then suspect your Vaio laptop and/or operating system. If you're running Windows XP, try changing settings as described in this ATE response. You may want to try unchecking the box that lets Windows manage your wireless settings and manually configure your NIC. You may also want to try disabling Windows Wireless Zero Config. Once you know you have a stable wireless connection, then you can go about debugging any dropped application connections that persist.
Dig Deeper on Wireless LAN (WLAN)
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