Caída web al activar plugin de cache en wordpress

Hola,

Cada vez que activo un plugin de cache se cae la web dando un error 500, me pasa con wp super cache y con w3 total cache.

[17-Dec-2015 02:37:50 UTC] PHP Fatal error: Out of memory (allocated 43778048) (tried to allocate 122880 bytes) in /home/mmeilan7/public_html/adelgazarrapidoweb.com/wp-includes/default-widgets.php on line 1340
[17-Dec-2015 02:37:50 UTC] PHP Fatal error: Out of memory (allocated 64487424) (tried to allocate 91 bytes) in /home/mmeilan7/public_html/adelgazarrapidoweb.com/wp-includes/pomo/mo.php on line 268
[17-Dec-2015 02:37:50 UTC] PHP Fatal error: Out of memory (allocated 68419584) (tried to allocate 24 bytes) in /home/mmeilan7/public_html/adelgazarrapidoweb.com/wp-includes/pomo/translations.php on line 96
[17-Dec-2015 02:37:50 UTC] PHP Fatal error: Out of memory (allocated 75497472) (tried to allocate 213645 bytes) in /home/mmeilan7/public_html/adelgazarrapidoweb.com/wp-includes/functions.php on line 295
[17-Dec-2015 12:46:32 UTC] PHP Fatal error: Out of memory (allocated 94896128) (tried to allocate 678443 bytes) in /home/mmeilan7/public_html/adelgazarrapidoweb.com/wp-content/plugins/w3-total-cache/lib/W3/ObjectCache.php on line 211
[17-Dec-2015 12:46:32 UTC] PHP Fatal error: Out of memory (allocated 75497472) (tried to allocate 678443 bytes) in /home/mmeilan7/public_html/adelgazarrapidoweb.com/wp-content/plugins/w3-total-cache/lib/W3/ObjectCache.php on line 211
[17-Dec-2015 12:46:32 UTC] PHP Fatal error: Out of memory (allocated 78643200) (tried to allocate 79 bytes) in /home/mmeilan7/public_html/adelgazarrapidoweb.com/wp-content/plugins/w3-total-cache/lib/W3/ObjectCache.php on line 211
[17-Dec-2015 12:46:32 UTC] PHP Fatal error: Out of memory (allocated 78643200) (tried to allocate 678443 bytes) in /home/mmeilan7/public_html/adelgazarrapidoweb.com/wp-content/plugins/w3-total-cache/lib/W3/ObjectCache.php on line 211
[17-Dec-2015 12:46:32 UTC] PHP Fatal error: Out of memory (allocated 76021760) (tried to allocate 30720 bytes) in /home/mmeilan7/public_html/adelgazarrapidoweb.com/wp-content/plugins/broken-link-checker/idn/idna_convert.class.php on line 570
[17-Dec-2015 12:46:32 UTC] PHP Fatal error: Out of memory (allocated 69992448) (tried to allocate 54284 bytes) in /home/mmeilan7/public_html/adelgazarrapidoweb.com/wp-content/plugins/w3-total-cache/lib/W3/ObjectCache.php on line 211

Un saludo

Marcos

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