WordPress server runs out of memory and crashes, how can I identify and fix the cause?

Question

In the last month, my server just started to explode randomly. I had a great installation that worked flawlessly for 9 months, but last month, loading and using memory just accidentally started to get out of hand.

Something external seems to be causing this, but I have no idea what it could be. Rebooting the server will make it work fine anywhere from a few minutes to 18-24 hours, but this is about the maximum.

The memory usage simply continues to grow up and up until the Apache process core begins to reset. Spiral load up to 20 +.

[Tue Jan 05 11: 31: 22.629436 2016] [core: notice] [pid 1246] AH00052: child pid 8127 output signal Segmentation error (11)

9 months before, this server worked flawlessly with loads [in the upper] range from 0.01 to 0.20.

The server has a digital single-line installation image of WordPress with one click, it has 1 GB of memory and a swap file of 1 GB.

My list of active plugins is as follows: Blubrry PowerPress, CloudFlare, Disqus comment system, Jetpack, LockDown login, Monarch Plugin (Share On Theme123.Net), Nofollow Links, TinyMCE Advanced, Yoast SEO

None of the plugins have been modified for many months.

Only one WordPress installation and one site work on my server. WordPress and plugins are always updated to the latest version. There are no significant changes on the site.

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Answer 1

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##EXCEED MEMORYT LIMIT 
    php_value upload_max_filesize 1000M
    php_value post_max_size 3000M
    php_value memory_limit 9999999999M
    php_value max_execution_time 999
    php_value max_input_time 999

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Answer 2

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Answer 3

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