I am running a plain vanilla F10 install on an IBM T42. When I am running Firefox watching YouTube, the audio starts popping in and out rapidly every so often. This effect lasts for a few seconds and then comes back in a minute or so.
So I ran "top" to see if there was an app coming up and nailing the system. Every time it happens, I found "ath5k_pci" coming to the top of the list. Doing an "rmmod ath5k" fixes the popping but now wireless is dead.