WP Mail SMTP with Gmail not sending

I am using WP Mail SMTP with Gmail. It works well for some time and then suddenly it stops sending emails. The solution is to “Remove Connection” via the WordPress->WP Mail STMTP-> Settings page, then re-add the connection.

But I want to make sure it works all the time. Does anybody have any suggestions for how to fix the problem of the form stopping to work all of the sudden?


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