Lyndon, I've got the same problem, but with the version for Community server.  I've a ticket open and hoping for resolution.  Did you get any help with yours or resolve it?

Hi,   I have a full license for cutechat for my domain but we haven't used it much since we bought it - it just didn't take up much. But, for some reason lately it's getting used loads and people are raving about it. However, I'm getting loads of people complaining that it's dropping their lines of text randomly. I tried this and ...