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Without seeing the database error log, then the best guess would be that you’re running out of RAM, so if you have a $5 droplet, then resize it to $10.
And if you are using CloudFlare’s offline-cache, then you need to setup some cache, since it visits every page within a very short time, which can easily drain the server for RAM.
Run the following command to show the last 40 lines of the database error log:
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