I have the same issue constantly!
Camera buzzes and screen is fuzzy when zooming in. This doesn't matter which mode the camera is in. Anytime we zoom, whether it's a photo or video, it becomes fuzzy and makes a strange buzz sound.
The temporary fix: Shake the phone vertically(while zoomed) to hopefully make the part that sticks, unstuck.
Stupid but it's done this for months but after reading many posts all over seems like it's pointless to ask for a fix.