I've had this problem twice now, where my zoom ring will not move past 20mm(just locks up) even when i use the zoom rockers or turning the zoom wheel with my fingers, but the first time it was only for like 1 day and somehow it just zoomed past 20mm up to 55mm, now like 2 months later it's happening again and im not sure how to fix it so any advice would be much appreciated. Thanks!
