Lost connection to MySQL server during query

SQL:
SELECT group_id id FROM cms_users_groups WHERE `default` = 1

MySQL server has gone away

SQL:
SELECT count(*) cnt FROM cms_pages WHERE page_path = '/archives/2016/' AND site_id = 1

MySQL server has gone away

SQL:
SELECT count(*) cnt FROM cms_pages WHERE page_path = '/archives/2016/'

MySQL server has gone away

SQL:
SELECT count(*) cnt FROM cms_pages WHERE page_path = '/archives/'

MySQL server has gone away

SQL:
SELECT p.*, c.* FROM cms_pages p, cms_pages_content c WHERE p.page_id = c.page_id AND c.lang = 'de' AND p.page_path = '/' AND p.site_id = 1

MySQL server has gone away

SQL:
SELECT count(*) cnt FROM cms_pages WHERE page_parent = AND site_id = 1

MySQL server has gone away

SQL:
SELECT * FROM cms_sites ORDER BY `default` DESC, binary(domain)

MySQL server has gone away

SQL:
SELECT count(*) cnt FROM cms_pages_access WHERE page_id = AND group_id =

MySQL server has gone away

SQL:
SELECT c.menu_title name_menu, p.page_path, p.page_parent pid, p.page_id id, p.page_order ord FROM cms_pages p, cms_pages_content c WHERE p.page_id = c.page_id AND c.lang = 'de' AND (p.page_parent = 0 OR p.page_parent = 1) AND p.page_active = 1 AND p.page_type != 'auth' AND p.page_type != 'edit_application' AND p.page_type != 'load_images' AND p.page_type != 'information_exchange' AND p.page_type != 'edit_accreditation' AND p.site_id = 1 ORDER BY page_parent, page_order

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MINISTRY OF CULTURE RF

English Deutsch Russia
MySQL server has gone away

SQL:
SELECT * FROM cms_catalogue WHERE page_id = AND site_id = 1 AND lang = 'de'

MySQL server has gone away

SQL:
SELECT * FROM cms_pages_links WHERE page_id =