Having the same exact problem. No ideas? – JimNov 20 '11 at 17:38
I've been experiencing the same thing, my hunch is that it's a server side problem on Facebook's end, as I've only noticed disconnects being a problem in the last few weeks. Before that I was running Facebook chat via iChat on Lion with no issues. – CanuckSkierNov 20 '11 at 20:20