require file doesn't exist until refresh

Question

I have a require line in my php script.

require_once('../main.inc.php');

every once in a while, when I load a page, I get a message 'failed to open stream. no such file or directory'

But when I hit refresh, the page loads just fine.

What might be happening that the script can't seem to find the file until I simply refresh?

I am really hitting the error at this point before I use the require/include

if(!file_exists('../main.inc.php')) die('Fatal error

Answer 1

try

include('../main.inc.php');