Camera motion blur

I'm sorry you are experiencing a problem, but troubleshooting is the only thing you can do as a user. If you do not wish to contact Apple Support, that is your decision. I've never read anything about users experiencing this problem after a major IOS update. I've never seen it. The only issue that I have read about I asked you about and that was something with Snapchat and other 3rd part camera apps. If you don't have the hardware checked, there is no way for you to be sure of what the issue is, since hardware is a possibility and not troubleshooting that to verify or eliminate that makes it to where you cannot be certain of the cause.

Are these Live photos? Are these photos taken with HDR? Since you have the iPhone 7, according to your profile, they cannot be in Night mode.

How much free space do you have on the iPhone, and how much total storage does the iPhone have? In other words, say you have a 32GB phone and you have 13GB free. This is just an example.

Okay, so it really isn't a space issue. Are you just using the native camera app, or something like Snapchat? There had been some issues with Snapchat and photo quality.

The only other suggestion that I could make is to make a Genius Bar appointment at the nearest Apple Store to have the hardware examined.