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Disable all your addons for start? How did this happen in the first place? did you change something in your site?
 
A couple of days ago, one of the hosting tech's rebuilt PHP in apache and litespeed in an effort to track down a bug that was resulting in a network error trying to do DNS lookups. Switched to apache, we ran testing, then switched back to litespeed. Hasn't been the same since.

NO new addon's lately, although I did run an update on Waindago's Installer/upgrader from 1.0.5.x to 1.0.8.x
 
I would disable all the addons using the config file, to make sure this isn't an addon causing it.
 
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