Things to consider when having trouble with your WiFi connection:
iPAQ RELATED FACTORS
1.) Reset the Wireless Adapter Always start your troubleshooting process by removing your iPAQ’s main battery (this only applies to iPAQs with a consumer accessible battery) for 30 seconds, then replacing the battery. This will force a core-reset of the wireless adapter, as well as a soft-reset of the iPAQ itself.
2.) Update your software: Make sure your iPAQ has the most recent BIOS, Firmware, and Drivers.