I have to ask why you asked the person in the room about something occuring locally on your machine, some people will play mind games with you if you give them the ammunition, hopefully this guy really didnt know what you where talking about.
I am not aware of any problems with the Chat server but of course we are all aware of other sorts of attacks that can cause problems with a connection.
I would use a network monitoring tool like x-netstat to check out any traffic directed at you to help narrow down the problem, I think you can run that one on a trail basis as its pay software but you only need it for a few hours at most.