User logged-in from front end is logged out automatically accessing wp-admin

have you tried by setting the second argument of wp_signon() to true or blank?
set false will prevent wp_signon() from setting secure cookie which is essential for accessing wp-admin if your using ssl.
i have tested and $user = wp_signon( $user_data, true ); works as expected.

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Hata!: SQLSTATE[HY000] [1045] Access denied for user 'divattrend_liink'@'localhost' (using password: YES)