«Help, my son has completely shut up!»

One question - three opinions
My son, 11, is in year 5. He has been a good pupil so far. Suddenly he has completely shut down and even refuses to do homework. I don't know the reason for this. His average grade is below a 4. I've cancelled his media consumption, but that hasn't helped. How can I get him to enjoy school and learning again?
What our team of experts says:

The team of experts:
Nicole Althaus, 51, is editor-in-chief of magazines and member of the editorial board of "NZZ am Sonntag", columnist and author. She initiated and managed the mum blog on tagesanzeiger.ch and was editor-in-chief of "wir eltern". Nicole Althaus is the mother of two children aged 20 and 16.
Stefanie Rietzler is a psychologist, author
("Geborgen, mutig, frei", "Clever lernen") and runs the Academy for Learning Coaching in Zurich. www.mit-kindern-lernen.ch
Peter Schneider, 62, is a columnist, satirist, psychoanalyst, private lecturer in clinical psychology at the University of Zurich and visiting professor for the history and scientific theory of psychoanalysis in Berlin.

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