Web server timeouts

I implemented a simple web page that updates/refreshes every 3 seconds, updating a textfield with some data from com0. It works fine for about 2 minutes but then the browser times out and is unable to get the page from the Digi.
I.E. reports “The page cannot be displayed”
Any ideas what could be causing this?

Turns that you cannot refresh too fast/often (2 seconds). Setting it to refresh every 10 seconds worked fine.