Postgresql INTERSECT randomly not working - postgresql

Question

I've got a problem with the syntax of a SQL query. It works sometimes and sometimes not. It's defenitly a problem with the query.
An error at or near "INTERSECTSELECT".
SQL Error: 0, SQLState: 42601
SELECT DISTINCT s.id,
s.title,
s.question,
s.comments,
s.start_date,
s.end_date,
s.motivation,
s.goals,
s.method,
s.type,
s.channel,
s.rhythm,
s.sample
FROM study s
LEFT OUTER JOIN study_customer_information sci
ON sci.study_id = s.id
LEFT OUTER JOIN customer_information ci
ON ci.id = sci.customer_information_id
WHERE s.is_active = :isActive
AND
s.language = :language AND s.id IN (SELECT sci.study_id
FROM study_customer_information sci
INNER JOIN customer_information ci
ON ci.id = sci.customer_information_id
WHERE ci.name_de in (:customer_informations)
GROUP BY sci.study_id
HAVING COUNT(sci.study_id) = :number_customer_informations INTERSECT SELECT st.study_id
FROM study_touchpoint st
INNER JOIN touchpoint tp ON tp.id = st.touchpoint_id
INNER JOIN subject_area sa ON sa.id = tp.subject_area_id
WHERE sa.name_DE = :subject_areas_0 INTERSECT SELECT st.study_id
FROM study_touchpoint st
INNER JOIN touchpoint tp ON tp.id = st.touchpoint_id
INNER JOIN touch_point_type tpt ON tpt.id = tp.touch_point_type_id
WHERE tpt.name_DE = :touchpoint_types_0 INTERSECT SELECT sth.study_id
FROM study_theme sth
INNER JOIN theme th
ON th.id = sth.theme_id
WHERE th.name_de in (:themes)
GROUP BY sth.study_id
HAVING COUNT(sth.study_id) = :number_themes) ORDER BY s.title