This happened to me as well and have been trying to figure out what is going on! In my case it took down the whole website and could not even access the backend. This is due to WordPress itself being an Addon to my XCart website. My hosting company said it was related to the use of Ioncube, but not sure I believe that reason …
It has happened 3 times and the hosting provider had to reset the server.
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This reply was modified 6 years ago by ouzillou.