database – How can I debug max_user_connections PHP Warning

I get the bottom error in the debug file frequently.
I am a beginner in WordPress. I think there is something wrong in theme. Is there any way to debug clearly when this PHP Warning happened?

PHP Warning:  mysqli_real_connect(): (HY000/1203): User timecode_main already has more than 'max_user_connections' active connections in /public_html/wp-includes/wp-db.php on line 1635