error PDOConnection.php

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Hello community, I have a problem with my website and found the following error in the Apache log. this is causing the apache service stop working after several similar errors. Any suggestions?


[Mon Aug 10 08:24:09 2015] [error] [client 10.2.111.9] PHP Fatal error:  Maximum execution time of 60 seconds exceeded in C:\\web\\apache\\htdocs\\concrete\\vendor\\doctrine\\dbal\\lib\\Doctrine\\DBAL\\Driver\\PDOConnection.php on line 44, referer: http://www.mdp.gov.py/
[Mon Aug 10 08:24:10 2015] [error] [client 10.2.111.9] PHP Fatal error:  Maximum execution time of 60 seconds exceeded in C:\\web\\apache\\htdocs\\concrete\\vendor\\doctrine\\dbal\\lib\\Doctrine\\DBAL\\Driver\\PDOConnection.php on line 44, referer: http://www.mdp.gov.py/
[Mon Aug 10 08:24:10 2015] [error] [client 10.2.111.9] PHP Fatal error:  Maximum execution time of 60 seconds exceeded in C:\\web\\apache\\htdocs\\concrete\\vendor\\filp\\whoops\\src\\Whoops\\Run.php on line 328, referer: http://www.mdp.gov.py/
[Mon Aug 10 08:24:10 2015] [error] [client 10.2.111.9] PHP Fatal error:  Maximum execution time of 60 seconds exceeded in C:\\web\\apache\\htdocs\\concrete\\vendor\\symfony\\http-foundation\\Symfony\\Component\\HttpFoundation\\Session\\Storage\\Proxy\\SessionHandlerProxy.php on line 75, referer: http://www.mdp.gov.py/
[Mon Aug 10 08:24:10 2015] [error] [client 10.2.111.9] PHP Fatal error:  Maximum execution time of 60 seconds exceeded in C:\\web\\apache\\htdocs\\concrete\\vendor\\symfony\\http-foundation\\Symfony\\Component\\HttpFoundation\\Session\\Storage\\Proxy\\SessionHandlerProxy.php on line 59, referer: http://www.mdp.gov.py/
[Mon Aug 10 08:26:47 2015] [warn] Server ran out of threads to serve requests. Consider raising the ThreadsPerChild setting