I'm hoping somebody might be able to help me.

I'm running Kentico Version: 4.0 Build: 4.0.3328 . I've implemented caching and made sure that <authentication debug="true" ../> in the web.config. The website seems fine but if you navigate away and go back about an hour later the website will be unresponsive. When I say unresponsive I mean I could navigate to the home page and nothing happens. I sometimes even have to navigate twice to get any response from the website. I thought this may be a caching issue but I've checked all the caching settings and they appear to be fine. The website is running under IIS 7.0.

Has anybody experienced any issues like this?

Sorry if I haven't provided enough useful info. If there's anything you need to know please ask and I'll provide it right away.

I hope somebody can help me. Thanks in advance,

Tom.