This may be actual for =< Fedora 17. There is great fedoraforum.org article about broadcom wireless drivers.
Open b43 (broadcom wireless) driver seems can work together with b44 (broadcom wired) driver, but not too well. On high load, for example - torrents, he can do such error:
ping: sendmsg: No buffer space available
And after that you may reload wireless or a whole system to make work it again. So temporary solution is to unload b44 module when wireless needs to be more stable at work.
Way to unload right now:
And we will get something like this:
sudo modprobe -v -r b44
Also for a long term it possible add to blacklist:
rmmod b44 rmmod mii
sudo vim /etc/modprobe.d/blacklist.conf
p.S. Seems there is interesting solution with broadcom-wl drivers. This could also work with b43.