Fatal error: Out of memory allocated tried to allocate bytes

Me aparece este error: Fatal error: Out of memory que se repiten con diferentes plugins.
Vemos que hay logs de errores que podrian generar un error 500 en el servidor
[27-Feb-2015 11:41:23] PHP Fatal error: Out of memory (allocated 31457280) (tried to allocate 7680 bytes) in /home/horibaic/public_html/wp-content/plugins/tubepress/vendor/ehough/tickertape/src/main/php/ehough/tickertape/EventDispatcher.php on line 161
[27-Feb-2015 11:41:23] PHP Fatal error: Out of memory (allocated 41418752) (tried to allocate 30720 bytes) in /home/horibaic/public_html/wp-content/plugins/testimonial-basics/widgets/katb_display_testimonial_widget.php on line 1120
[27-Feb-2015 11:41:23] PHP Fatal error: Out of memory (allocated 24117248) (tried to allocate 122880 bytes) in /home/horibaic/public_html/wp-content/plugins/sexy-contact-form/includes/display-functions.php on line 247
[27-Feb-2015 11:41:23] PHP Fatal error: Out of memory (allocated 26476544) (tried to allocate 7680 bytes) in /home/horibaic/public_html/wp-content/plugins/tubepress/src/main/php/classes/tubepress/spi/version/Version.php on line 179
[27-Feb-2015 11:41:23] PHP Fatal error: Out of memory (allocated 47710208) (tried to allocate 72 bytes) in /home/horibaic/public_html/wp-includes/pomo/mo.php on line 246
[11-Mar-2015 06:19:48] PHP Fatal error: Out of memory (allocated 19922944) (tried to allocate 122880 bytes) in /home/horibaic/public_html/wp-includes/media.php on line 1834
[11-Mar-2015 06:19:48] PHP Fatal error: Out of memory (allocated 39321600) (tried to allocate 7680 bytes) in /home/horibaic/public_html/wp-includes/pluggable.php on line 1219
[11-Mar-2015 06:19:48] PHP Fatal error: Out of memory (allocated 52690944) (tried to allocate 30720 bytes) in /home/horibaic/public_html/wp-content/plugins/tablepress/models/model-table.php on line 506
[11-Mar-2015 06:19:48] PHP Fatal error: Out of memory (allocated 53477376) (tried to allocate 82 bytes) in /home/horibaic/public_html/wp-includes/pomo/mo.php on line 238
[11-Mar-2015 06:19:48] PHP Fatal error: Out of memory (allocated 31981568) (tried to allocate 8 bytes) in /home/horibaic/public_html/wp-content/plugins/tubepress/src/main/php/add-ons/core/classes/tubepress/addons/core/impl/options/CoreOptionsProvider.php on line 274

Hemos desinstalado los plugins; tablepress y tubepress para ver si se reducen los errores. Pasamos revisión nuevamente con Stephan y los resultados se repiten.

Como podríamos solucionarlo ? Gracias.

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