I also noticed the same thing in the past week with my iPhone 8.
"Live photos" are deactivated and even when the light conditions are near perfect pictures of slightly moving objects/people turn out to be blurry.
I tried to google the problem, but i couldn't find anything...
could you solve it somehow or did you contact apple care/went to an apple store?
p.s. we can't possibly be the only ones with this issue, right? anyways, tomorrow i'll go check some of the floor models at my local the apple store to see if it's a software problem or if our devices are simply faulty.