Warning-Fatal error after some minutes - Timeout????

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My Website works pretty good, except when it remains some minutes open
without that any click will be made. For example, I'm in breweries.php
(a subpage from index.php) and I make nothing except perhaps scrolling.
After around 5 minutes I want to go back to the previous page or to the
following and I receive the following message:

Warning: main(lang..inc.php): failed to open stream: No such file or
directory in /home/coaster/public_html/breweries.php on line 15

Fatal error: main(): Failed opening required 'lang..inc.php'
(include_path='.:/usr/local/lib/php') in
/home/coaster/public_html/breweries.php on line 15

Das doesn't happen normally after a minute or when I click somewhere on
the page.
After refresh everything works again good.The lang..inc.php exist.
Does it has something to do with a timeout or something like that?
Any help will be appreciated.

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