Hello @arnaud,
Did you make sure to tighten the hopper properly? Don't be afraid to screw it in very tight. This should keep the hopper from rotating along.
Can you please let me know if this works? If not please attach a picture of the connection between the machine and the hopper.
Best regards,
Timo
hellom
Thanks for answer. Material which I was drying blocked the hooper. Because that's why it began to turn. Problem solved