A core dump file consists of the recorded state of the working memory of a computer program at a specific time, generally when the program has terminated abnormally. Core dumps are often used to assist in diagnosing and debugging errors on programs. Normally core dumps are creating on a wordpress account because of outdated wordpress, plugins or themes or the conflicts with the installed plugins or themes.
On checking your account, I can see the plugin located at /home/*******/public_html/wp-content/plugins/essential-grid , appears to be the issue. It look like this plugins is conflicting with other plugins like jetpack etc.