It could be a problem with the zoom control lever. Remove the camera top, following the iFixit guide, and if the contacts are accessible, look for any signs of contamination or damage and clean them with isopropyl alcohol.
It could be a problem with the zoom control lever. Remove the camera top, following the iFixit guide, and if the contacts are accessible, look for any signs of contamination or damage and clean them with isopropyl alcohol.