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Could not establish database connection. Please check the username, password and hostname in the config file, and if necessary set up the appropriate MySQL user and privileges.

Hey, I am getting this error on home page (only home page and unanswered page), if i press 

CTRL + SHIFT + R 

then website is loading properly. How can I fix that? Please help me.

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if I call "index.php" then there is no problem

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because of caching.
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