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RealPlayer

I had the same issue on 10.5.4-

Wifes MBA worked perfectly on 5.4
My MBP would drop out randomly from a router.

Solution - Used app zapper and uninstalled RealPlayer

Now back to a rock solid wireless connect :)

So bloody annoying from real - I wont be using that product again.
 
If you need to play Realplayer (i.e .rm) I suggest you use MPlayer and then get the codecs pack to enable it to play .rm/.rmvb files. Works like a charm. Not too sure about embedded content though.
 
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