使用php时经常崩溃

I am using curl 7.42.1 with php 5.6.16, It crashing frequently and during debug it give http_code=>0. I have tried by increasing timeout but still it gives http_code 0. I rebuild curl and it getting fix automatically, and crash again after some days. I have tried latest version of curl 7.46.0 but 7.42.1 seems more stable. Using curl on CentOS release 6.7

What could be reason behind frequently crashing ?

here is curl options which i am using

$this->curlArray=array(
        CURLOPT_URL=>'http://stackoverflow.com/',
        CURLOPT_HEADER=>false,
        CURLOPT_FAILONERROR=>false,
        CURLOPT_RETURNTRANSFER=>true,
        CURLOPT_FORBID_REUSE=>true,            
        CURLOPT_FRESH_CONNECT=>true,
        CURLOPT_CONNECTTIMEOUT=> 3,
        CURLOPT_TIMEOUT=>  3            
    );