The same problem began happening to me after I upgraded my kernel a week or so ago. I also use the bc43xx-fwcutter thing for my linksys wireless g pci card when my internet started running slow I opened a terminal and ran the following.
Code:
sudo /etc/init.d/networking restart
And it said somtething like
Ignoring unknown interface WLAN0
When I ran the command again it didn't say that again and my internet ran smoothly for a while. So when my internet started running slow again I ran the command again. The first time it complained about unknown interface WLAN0 and the second time it didn't and my internet started running smootly again.
This seems to be a temporary fix for me. Please let me know how it works for you.
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