The ones I'm seeing "turning down" is what I'd consider a relaxed plant,, ie; happy - happy - happy. Something I work for and try to maintain. But maybe I'm not looking at the right ones?
I do however see some tips starting to show signs.
Most likely, they'll not come back to picture perfect. Seems from earlier growth, with the newer growth looking quit fine. I'd watch them for sure. If the newer growth starts... then you've a minor issue.
I've seen that a lot with my autos. Noticed it was with some breeders more than other (But that could be just my case). After harvest on a few I started noticing the roots were not as prolific as some.
I took it to mean the roots couldn't keep up with the transpiration rate. After I quit "pushing" them and let them grow in a more relaxed way, they started growing better for me. I cut back on nutes, light intensity, and added 1 oz peroxide (oxygen thing) per qt. of water and they started staying fine.
It may be the same for you? Just a thought.