I'd start by upgrading the wireless drivers on the machine to the latest available at Panasonic.
I'd also make some adjustments to the router.
Some things you can try here.
- For wireless connections, change the channel on the router, I like channels 1, 6, and 11 in the US.
- For wireless connections, try moving either the wireless router/AP or the wireless computer. Even a couple of feet will sometimes make a big difference.
- Update the firmware to the latest version available on the manufacturer's site.
- Reset the router to factory defaults and reconfigure.
Many times these measures will resolve a lot of intermittent issues.
My Panasonic Toughbook (model CF-18) connects to any wi-fi with no problem until I download anything (file,video,music etc.) then suddenly loses the connection.It immediately comes back when the download fails,then dissappears again on retry.Same thing happens when watching streaming video. Using windows xp and a Intel Pro wireless LAN 2100 3B mini PCI adaptor. 
