When I am switching from horizontal to vertical setting there is a slight vibration on the screen. Its not there on SPINSHOT mode.
The mount is tight and square to my phone and it happens on both my iPhone Pro Max 12 and 13.
Any ideas why?

Hello there olcmike. I am sorry for the trouble this has caused and thank you for reaching out. Kindly please try to calibrate your DJI OM 5 for us to see if the issue will still persist? In addition kindly please post a short sample video showing the said issue for us to see and can assist you further? Thank you.