You can find comfort in that it’s most likely a faulty OIS

Probably defect OIS. Hope it’s still under warranty otherwise it’s probably going to cost a pretty penny.

At the bottom you can see exactly how many GB system data and iOS use. Mine use 29,44 gb system data and 9,47 gb iOS. I’m on 16.2.

Are you using iCloud to store photos? Have you enabled optimize photos and offload unused apps?

Or use iCloud