MySQL has gone away.

Ich bekomme seit kurzem sehr oft Fehlermeldungen wie die Folgende in meinem Shop, aber eben auch nicht immer. Kann mir da jemand nen Tipp geben, woran es liegt/liegen könnte? [quote]Warning: PDO::__construct() [pdo.–construct]: MySQL server has gone away in /var/www/engine/Enlight/Vendor/Zend/library/Zend/Db/Adapter/Pdo/Abstract.php on line 129 Fatal error: Uncaught exception ‚Zend_Controller_Response_Exception‘ with message ‚Cannot send headers; headers already sent in /var/www/engine/Enlight/Vendor/Zend/library/Zend/Db/Adapter/Pdo/Abstract.php, line 129‘ in /var/www/engine/Enlight/Vendor/Zend/library/Zend/Controller/Response/Abstract.php:321 Stack trace: #0 /var/www/engine/Enlight/Vendor/Zend/library/Zend/Controller/Response/Abstract.php(115): Zend_Controller_Response_Abstract->canSendHeaders(true) #1 /var/www/engine/Shopware/Controllers/Frontend/Error.php(26): Zend_Controller_Response_Abstract->setHeader(‚Content-Type‘, ‚text/html; char…‘) #2 /var/www/engine/Enlight/Enlight/Controller/Action.php(55): Shopware_Controllers_Frontend_Error->errorAction() #3 /var/www/engine/Enlight/Enlight/Controller/Dispatcher/DispatcherDefault.php(329): Enlight_Controller_Action->dispatch(‚errorAction‘) #4 /var/www/engine/Enlight/Enlight/Controller/Front.php(88): Enlight_Controller_Dispatcher_DispatcherDefault->dispatch(Object(Enlight_Controller_Request_RequestHttp), Object(En in /var/www/engine/Enlight/Vendor/Zend/library/Zend/Controller/Response/Abstract.php on line 321[/quote]