I just upgraded to the 10.5.0.0 drivers for XP today from 9.x, to deal with the security issues recently discovered in the old drivers. Since upgrading, my laptop will connect to the AP (Linksys WAP54G, firmware version 3.04), but every 10 seconds or so it will lose the connection and reassociate. The gap between the reconnections is very regular. After a while of this I get a couple of minutes of uptime, but then the cycle repeats.
The only thing that had changed in my network configuration is the laptop's driver version. But I've since tried tweaking power management, preamble mode and making sure WZC is disabled on the laptop, and messing with the AP's settings (beacon interval was already at 25ms, down from the default 100) - all to no avail.
This is extremely frustrating - can anyone suggest anything?