As an addendum, perhaps before you get too involved, it's worth disabling all the plugins, making sure WordPress is fully up to date and see how that goes?
At least then you should be a bit clearer whether it's likely something to do with Apache/PHP config and/or WordPress itself, or whether it's one of your plugins.
Actually as an addendum
As an addendum, perhaps before you get too involved, it's worth disabling all the plugins, making sure WordPress is fully up to date and see how that goes?
At least then you should be a bit clearer whether it's likely something to do with Apache/PHP config and/or WordPress itself, or whether it's one of your plugins.
Just a thought...