All of a sudden, my website has begun throwing this error every time one tries to post a new article and/or topic. The odd thing is that the article/topic still posts without an issue. After a while, the browser will go to the white screen displaying the Gateway Timeout 504 error display but if you go to the website, you will notice the article/post was created without a problem.

 

Any ideas?

 

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I followed instructions in this thread

 

I did not use Elasticsearch and change e-mail setting from PHP to Sendgrid.
Also, I disabled all notification through e-mail to all website member.

However there is a still problem to post in the forum properly.

Any ideas?

Anything relevant in your server error logs?