Problemas e lentidão

Pessoal, boa noite!

Estou com alguns problemas. Estou com um site que tem gerado alguns erros em dois error_log.

E não faço a mínima ideia de como resolver e um detalhe é que tem causado uma lentidão extrema na navegação do site.

error_log da parta wp-admin

[19-Oct-2017 20:51:28 UTC] Erro de banco de dados do WordPress You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near '%2$s
			 WHERE target_post_id IN( %3$s )
		  GROUP BY target_post_id' at line 2 para a consulta 
			SELECT COUNT( id ) AS incoming, target_post_id AS post_id
			  FROM %2$s
			 WHERE target_post_id IN( %3$s )
		  GROUP BY target_post_id feita por edit_post, wp_update_post, wp_insert_post, do_action('save_post'), WP_Hook->do_action, WP_Hook->apply_filters, call_user_func_array, wpcf_pr_admin_save_post_hook, WPCF_Relationship->save_children, WPCF_Relationship->save_child, wp_update_post, wp_insert_post, do_action('save_post'), WP_Hook->do_action, WP_Hook->apply_filters, call_user_func_array, WPSEO_Link_Watcher->save_post, WPSEO_Link_Content_Processor->process, WPSEO_Link_Content_Processor->update_incoming_links, WPSEO_Meta_Storage->update_incoming_link_count
[19-Oct-2017 21:31:25 UTC] Erro de banco de dados do WordPress You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near '%1$s )' at line 3 para a consulta 
				SELECT internal_link_count, incoming_link_count, object_id
				FROM wp_yoast_seo_meta
			    WHERE object_id IN ( %1$s ) feita por WP_List_Table->display, WP_List_Table->display_tablenav, WP_Posts_List_Table->extra_tablenav, do_action('manage_posts_extra_tablenav'), WP_Hook->do_action, WP_Hook->apply_filters, call_user_func_array, WPSEO_Link_Columns->count_objects, WPSEO_Link_Columns->set_count_objects, WPSEO_Link_Column_Count->set, WPSEO_Link_Column_Count->get_results
[19-Oct-2017 21:37:48 UTC] Erro de banco de dados do WordPress You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near '%1$s )' at line 3 para a consulta 
				SELECT internal_link_count, incoming_link_count, object_id
				FROM wp_yoast_seo_meta
			    WHERE object_id IN ( %1$s ) feita por WP_List_Table->display, WP_List_Table->display_tablenav, WP_Posts_List_Table->extra_tablenav, do_action('manage_posts_extra_tablenav'), WP_Hook->do_action, WP_Hook->apply_filters, call_user_func_array, WPSEO_Link_Columns->count_objects, WPSEO_Link_Columns->set_count_objects, WPSEO_Link_Column_Count->set, WPSEO_Link_Column_Count->get_results
[19-Oct-2017 22:03:41 UTC] Erro de banco de dados do WordPress You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near '%1$s )' at line 3 para a consulta 
				SELECT internal_link_count, incoming_link_count, object_id
				FROM wp_yoast_seo_meta
			    WHERE object_id IN ( %1$s ) feita por WP_List_Table->display, WP_List_Table->display_tablenav, WP_Posts_List_Table->extra_tablenav, do_action('manage_posts_extra_tablenav'), WP_Hook->do_action, WP_Hook->apply_filters, call_user_func_array, WPSEO_Link_Columns->count_objects, WPSEO_Link_Columns->set_count_objects, WPSEO_Link_Column_Count->set, WPSEO_Link_Column_Count->get_results
[19-Oct-2017 22:11:08 UTC] Erro de banco de dados do WordPress You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near '%1$s )' at line 3 para a consulta 
				SELECT internal_link_count, incoming_link_count, object_id
				FROM wp_yoast_seo_meta
			    WHERE object_id IN ( %1$s ) feita por WP_List_Table->display, WP_List_Table->display_tablenav, WP_Posts_List_Table->extra_tablenav, do_action('manage_posts_extra_tablenav'), WP_Hook->do_action, WP_Hook->apply_filters, call_user_func_array, WPSEO_Link_Columns->count_objects, WPSEO_Link_Columns->set_count_objects, WPSEO_Link_Column_Count->set, WPSEO_Link_Column_Count->get_results
[19-Oct-2017 22:29:41 UTC] Erro de banco de dados do WordPress You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near '%1$s )' at line 3 para a consulta 
				SELECT internal_link_count, incoming_link_count, object_id
				FROM wp_yoast_seo_meta
			    WHERE object_id IN ( %1$s ) feita por WP_List_Table->display, WP_List_Table->display_tablenav, WP_Posts_List_Table->extra_tablenav, do_action('manage_posts_extra_tablenav'), WP_Hook->do_action, WP_Hook->apply_filters, call_user_func_array, WPSEO_Link_Columns->count_objects, WPSEO_Link_Columns->set_count_objects, WPSEO_Link_Column_Count->set, WPSEO_Link_Column_Count->get_results
[20-Oct-2017 00:09:06 UTC] Erro de banco de dados do WordPress You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near '%1$s )' at line 3 para a consulta 
				SELECT internal_link_count, incoming_link_count, object_id
				FROM wp_yoast_seo_meta

E o error_log da pasta public_html

[20-Oct-2017 00:28:36 UTC] PHP Warning:  explode() expects parameter 2 to be string, array given in /home/spartanassp/public_html/wp-includes/pluggable.php on line 767
[20-Oct-2017 00:28:44 UTC] PHP Warning:  explode() expects parameter 2 to be string, array given in /home/spartanassp/public_html/wp-includes/pluggable.php on line 767
[20-Oct-2017 00:28:44 UTC] PHP Warning:  explode() expects parameter 2 to be string, array given in /home/spartanassp/public_html/wp-includes/pluggable.php on line 767
[20-Oct-2017 00:42:32 UTC] PHP Warning:  explode() expects parameter 2 to be string, array given in /home/spartanassp/public_html/wp-includes/pluggable.php on line 767
[20-Oct-2017 00:42:40 UTC] PHP Warning:  explode() expects parameter 2 to be string, array given in /home/spartanassp/public_html/wp-includes/pluggable.php on line 767
[20-Oct-2017 00:42:41 UTC] PHP Warning:  explode() expects parameter 2 to be string, array given in /home/spartanassp/public_html/wp-includes/pluggable.php on line 767

São esses os erros que consegui identificar no error_log.

Alguém já viu algo parecido?