Drupal 7 Site Crashes Many Times [on hold]


I’ve had a site running on:

  • Drupal 7.59
  • Database system MySQL, 5.7.22-0 ubuntu 16.04.1
  • PHP memory limit 128M

It has crashed many times due to the running out of memory problem. Besides, this problem started a month ago.

Another problem is in the cache database table (cache_menu), keeps growing bigger every time a when pages are loaded.
Even if I change the “Expiration of cached pages” from the performance menu to 1 hour, the cache can become huge, which leads to major memory problems.
Is there a way to safely disable cache_menu?

But I’m not sure that the only reason is the cache menu.
What could be causing this and how can I fix it?
Any advice much appreciated.

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