well, on site survey when I get below 45% signal it just wont connect. Try going to Edit porfiles and Wireless networks option on Add new settings, try adding the ssid manually and the wep key and shared mode (if in use), once you enable it on your house! and see what happens, works for me on my x3i.
The funny thing is that if it cant connect to the network that is available, it displays a connected to the network it last accessed!
Try www.aximsite.com great site with a bunch of info for dell pda's
BTW do you sync your PDA with your carputer? I heard that with bt on the carputer as well it could be used as a remote!