plant had a heartattack!! help!

got a plant, 60days into veg, like on the 9th node.. soil grow.. i use the liquid nutes diluted in bottled water, pH at 6.8ish

watered it 2 days ago with some nutes (definitely not alot), and 4days prior.. they've been on a small nute regimen since july. every 3-4 days i water, or when the soil seems dry.. I usually give half of half the recommended dosage, cus my first grow was ruined due to overfert and i've been extra cautious ever since..

so i check on everything and all seems fine.. i go to the bathroom, cook up a breakfast, do some things over the course of 2 more hours, and my plants droopy as shit 3days after watering.. new growth is drooping over thhe hard stem, no leaf will support itself.. soil appears simply fresh..

soil is starting to dry up on the 3rd day, but i never overwater.. greyish-brown streaks are forming from the center of each finger on each leaf.. i've never had a problem with this plant before

the first 2 days the plant was completely fine... now its like reached a critical roadblock.. kid was put in the ground june 10th. wtf?!

Sounds like it could be a root problem.

i cut a clone on the 1st of this month. ever since, i've had it in a big cup sealed off wit plastic wrap and water left on the underside to evaporate and create a humidome effect for the cutting's first weeks in root developement.

I took it out of the "dome" twice to check on its roots, and they're coming in! but with in the total 30minutes of being outside its dome, the plant completely withers in weakness and droops itself onto the soil its stuck in..why wont it stay up??

before the last 15 minute shock it had, it was looking great. after 15minutes, the plant was laid out like it got struck with the plague. i put it back in the dome and its gained the strength to get back up within another 15min.. however the leafs were discolored from what looks like a phosphorus deficiency (out of nowhere?!).. before that clone even came out the dome, it was healthy green.. 15min the clone is begging for lifesupport.. 30min i have heavy signs of phosphorus deficiency..?? wtf?!

how do i fix this? why can't this one survive on its own?

I have another clone that was cut the same day.. I also took this one out the dome, but its roots haven't shown in the soil at all (from the edges, im not gonna poke throughout the soil for roots for fear i might damage, and i dont think good cultivators doo that sort of stuff to their babies lol) however its able to fully support itself.. i dont get it.. can anyone help with this issue?

a root problem..? crap

did you ever figure out if this was a root problem on your droopy plant? im having damn near the same issues this year, and have ruled out almost everything else i can think of, other than maybe the roots are having a hard time going from soft supple soil to the original earth soil that was there before???