Prototype AJAX Randomly Stops Working

I have written numerous AJAX webapps with the prototype ajax library, but recently  they have randomly stopped working, and then just started up again a day later or so.  My friend had told me that it was the AJAX request failing, but I'm not sure why that would happen only SOMETIMES.

Any ideas?

Are you running any open source software on that box of yours?

You should use a tool like Fiddler to trace the HTTP requests, and see what's wrong.
DarthVader, stfu. It's bad enough you polute the Coffeehouse with the garbage you post.