Same problem I had. Drivers door did the same. The day l picked car up. !!!
Took it back the next day and was told I'd have to video it happening, as car still under manufactory warranty and the citroen dealership needs 'evidence' before he could submit a claim.
NOT even a offer to check it out.
Are all citroen dealerships this unhelpful. ??
Strangely it hasn't done it since I manually folded it in an out.
Fingers crossed ¿