Errores con bases de datos mysql en Wordpress

Hola chicos y chicas!

Tengo un problema con mi hosting porque le estoy sobrecargando el servidor. La cuestión es que estamos creando un wordpress y por lo visto se realiza una consulta a la bbdd constantemente que agotan los recursos del servidor.
Primero pensé que podría ser por un plugin "Custom Content Type Manager " que podría estar dando problemas, pero lo desactivé y se seguían haciendo las consultas y además me pasa que pierdo la conexión de wordpress constantemente. No sé si realmente están relacionados. Como veréis estoy bastante verde!

Os copio y pego lo que me dicen a ver que solución encontráis, de dónde vienen esas consultas... Muchas gracias!

se están realizando una serie de consultas que agotan todos los recursos del servidor, estas son dichas consultas:

13921 wp-c7063c13ead72 localhost wp_c7063c13ead72e2b Query 1017 Copying to tmp table SELECT DISTINCT SQL_CALC_FOUND_ROWS wp_users.* FROM wp_users INNER JOIN wp_usermeta ON wp_use
rs.ID =
13922 wp-c7063c13ead72 localhost wp_c7063c13ead72e2b Query 1013 Copying to tmp table SELECT DISTINCT SQL_CALC_FOUND_ROWS wp_users.* FROM wp_users INNER JOIN wp_usermeta ON wp_use
rs.ID =
13924 wp-c7063c13ead72 localhost wp_c7063c13ead72e2b Query 1003 Copying to tmp table SELECT DISTINCT SQL_CALC_FOUND_ROWS wp_users.* FROM wp_users INNER JOIN wp_usermeta ON wp_use
rs.ID =
13925 wp-c7063c13ead72 localhost wp_c7063c13ead72e2b Query 965 Copying to tmp table SELECT DISTINCT SQL_CALC_FOUND_ROWS wp_users.* FROM wp_users INNER JOIN wp_usermeta ON wp_use
rs.ID =
13927 wp-c7063c13ead72 localhost wp_c7063c13ead72e2b Query 938 Copying to tmp table SELECT DISTINCT SQL_CALC_FOUND_ROWS wp_users.* FROM wp_users INNER JOIN wp_usermeta ON wp_use
rs.ID =
13930 wp-c7063c13ead72 localhost wp_c7063c13ead72e2b Query 921 Copying to tmp table SELECT DISTINCT SQL_CALC_FOUND_ROWS wp_users.* FROM wp_users INNER JOIN wp_usermeta ON wp_use
rs.ID =
13931 wp-c7063c13ead72 localhost wp_c7063c13ead72e2b Query 902 Copying to tmp table SELECT DISTINCT SQL_CALC_FOUND_ROWS wp_users.* FROM wp_users INNER JOIN wp_usermeta ON wp_use
rs.ID =
13932 wp-c7063c13ead72 localhost wp_c7063c13ead72e2b Query 894 Copying to tmp table SELECT DISTINCT SQL_CALC_FOUND_ROWS wp_users.* FROM wp_users INNER JOIN wp_usermeta ON wp_use
rs.ID =
13934 wp-c7063c13ead72 localhost wp_c7063c13ead72e2b Query 872 Copying to tmp table SELECT DISTINCT SQL_CALC_FOUND_ROWS wp_users.* FROM wp_users INNER JOIN wp_usermeta ON wp_use
rs.ID =
13936 wp-c7063c13ead72 localhost wp_c7063c13ead72e2b Query 846 Copying to tmp table SELECT DISTINCT SQL_CALC_FOUND_ROWS wp_users.* FROM wp_users INNER JOIN wp_usermeta ON wp_use
rs.ID =
13937 wp-c7063c13ead72 localhost wp_c7063c13ead72e2b Query 846 Copying to tmp table SELECT DISTINCT SQL_CALC_FOUND_ROWS wp_users.* FROM wp_users INNER JOIN wp_usermeta ON wp_use
rs.ID =
13939 wp-c7063c13ead72 localhost wp_c7063c13ead72e2b Query 816 Copying to tmp table SELECT DISTINCT SQL_CALC_FOUND_ROWS wp_users.* FROM wp_users INNER JOIN wp_usermeta ON wp_use
rs.ID =
13942 wp-c7063c13ead72 localhost wp_c7063c13ead72e2b Query 803 Copying to tmp table SELECT DISTINCT SQL_CALC_FOUND_ROWS wp_users.* FROM wp_users INNER JOIN wp_usermeta ON wp_use
rs.ID =

La petición que genera en mysql los procesos anteriores es:

SELECT DISTINCT SQL_CALC_FOUND_ROWS wp_users.* FROM wp_users INNER JOIN wp_usermeta ON wp_users.ID = wp_usermeta.user_id
INNER JOIN wp_usermeta AS mt1 ON (wp_users.ID = mt1.user_id)
INNER JOIN wp_usermeta AS mt2 ON (wp_users.ID = mt2.user_id)
INNER JOIN wp_usermeta AS mt3 ON (wp_users.ID = mt3.user_id)
INNER JOIN wp_usermeta AS mt4 ON (wp_users.ID = mt4.user_id) WHERE 1=1 AND (wp_usermeta.meta_key = 'wp_capabilities'
OR (mt1.meta_key = 'wp_capabilities' AND CAST(mt1.meta_value AS CHAR) LIKE '%administrator%')
OR (mt2.meta_key = 'wp_capabilities' AND CAST(mt2.meta_value AS CHAR) LIKE '%editor%')
OR (mt3.meta_key = 'wp_capabilities' AND CAST(mt3.meta_value AS CHAR) LIKE '%author%')
OR (mt4.meta_key = 'wp_capabilities' AND CAST(mt4.meta_value AS CHAR) LIKE '%contributor%') ) ORDER BY user_login ASC;