Branch wilting

Ive had about 8 of the Jack Herer Im growing get this unexplainable wilting. Its usually only branch or top at a time. Not dry,not overwatered, no breaks or pinch8ng done, no bugs tht I know of. Im at a commercial grow. My temp is around 73 and humidity kinda jumps sometimes but usually around 60%. Any ideas? Fungal? Gentetic? Thnx in advance!

To me it looks like someone bumped into the branch and caused a cut or break somewhere. Otherwise I would guess a root problem where some part is not getting watered properly or fully.

Hmmmm
That possibly could be airpockets from not getting fully saturated. This is in veg and alot of times I do not soak pot. We just switched to Tupar which is coco& perlite. Which I know coco does not like dry. Thy looked a bit better after a thorough push but some still have a little wilt. It was numerous plants too no signs of breakage or injuries. Weird thing tho its only in the Jacks out of 1300 plants of different varieties...
I think it might be dry pockets and thy just are sensitive, I sure hope!! Thanks so much for your resonse!

Slower more careful watering. It can be annoying with a big grow and lots of time but it should solve the problem.