Have the same issue with my Xs and Xs Max. Camera focuses in and out. Close app and still does it. Only way to get it to stop is to turn the phone off and then back on. It will then do it again randomly. [https://youtu.be/ChT0LBKOvV8/URL]
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This is by no means a fix but I find tap and hold of the screen will give you a quick window of focus
Are you running iOS 12 regular or beta. I had this issue on some of the 12.0 betas over the summer.
Since it occurs on both devices, I would think it's in the OS. There may be corruption in your back up. Have you tried restoring as new, not from a back up?
So you have had this issue as well?
Wouldn’t I lose everything if I did this? Sounds like others are having this same problem.
Not if you put your photos somewhere safe, like on your computer or in a cloud app like Dropbox or Google photos. Your apps are still in your purchased list. One thing you might try first, is Reset All Settings. You won't lose anything. It fixes a lot of issues.
I have already done that. The more and more I talk with people I’m finding that it’s not just my two phones. Seems to be a iOS problem.