You could try to knock onto the back. There seems to be a problem at the connection between mainboard and Wireless LAN chip.
I have written an article on TamsPalm-DE http://tamspalm.pytalhost.eu/2007/0...en-c-von-innen/
(sorry, no English text yet) with two photos of the mainboard / WLAN chip. You need a Torx T6 screw driver to open your Palm. Then take out the WLAN chip and insert it again. It *could* help (it helped someone on Nexave, but not too much me).