One user Having problems. Can't figure anything out

[Reycer]

Hi all, I have a user that has sent me multiple emails over the last 8 months (or so). He is complaining that only when he is on my forum, when he clicks on "Post Reply" or "New Thread" that the page just sits there and spins and then eventually says "Failure to Connect"

The problem is, that he is the ONLY person to have ever complained about this, and I eventually sent out a mass email asking if anyone else was experiencing these problems. Guess what, he was the only one to respond with a problem. Today, I got yet another email from him.

I never have problems, except on your forum..I use Firefox and open 3 or 4 windows at a time, everywhere..

As an example, on brand x I will open the main page, click on "general" and open 3 or 4 "tabs" to read and reply to various threads..
Never a glitch..I often "clear my data" before moving on to another site..

I open your forum, open "general" and click on 1 thread to read..If I want to make a reply, I click on "quote" or "reply" and if the window takes me there I type in my comment.. Most always, the page will sit and spin and finally give me a page stating "failure to connect"..

It is very frustrating and I don't understand it because it happens no where else..

Anyone have any thoughts as to why this one person would be having this kind of trouble.