Server plesk down after a 500 error

Hello everyone,

Yesterday I had a problem, I explain, I modified a page with Divi on WordPress, then I had an error 500 which is unusual.

Then, all the other sites, including the one I was working on, hosted on an OVH server, via Plesk, crashed. Two weeks ago we had problems with OVH because we migrated.

I had to delete the page that had caused the problem, and then the problem went away. I don't know why. I even reinstalled WP.

This morning, it happens again, while modifying another...

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