Mine did the same on Dell 3945 and Dell 1390/bcm4311mcg , dell wifi does not like the new fancy wifi drivers in 1.0BE and 3.4a , it works sometimes and or slow, never speeds up as suggested so the only fix I could find for now was to use ndiswrapper and the windows drivers for this.
This is driver bug not Sabayon bug. Dell 1390 bcm4311mcg works but very slow , intel/dell 3945 no connect at all.
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Browse to folder having windows .inf files for wifi device.
ndiswrapper -i bcmwl5.inf
rc-update add net.wlan0 default
and add " ndiswrapper " to /etc/modules.autload.d/kernel-2.6
You would have to unload the current mac80211 / iwl3945 by using
modprobe -r iwl3945
try them until they are all gone , if error try next as some is linked and stuborn so boss goes then workers goes as well. Not sure if needing to blacklist them as well and or stop from loading at boot I would presume it is a good idea to.
If the ipw3945 module was still there you might be able to load it but was removed as far as I have seen not iwl3945 = not working , ipw3945 works.
Hope this gets you going until they can fix it.