Emergency!!! Plants dying quickly!!! Curling under leaves.

I would think that if they go that quick it is a water or root issue rather nutes. Nutes progress with a problem. If something happens in a matter of days and it isn't a severe burn, usually it is a water or pH problem. Assuming you are running your pH around 5.8 in a hydro system, I'd check your roots. Gently pull a plant up enough to see the roots (unless you have a better way). Root rot will cause the roots to look brown and sick. I will try to help you more if you can give me more detail:
pH
watering schedule
feed rates and interval
system details
leaf color (all over the plant)
Are they healthy and vibrant right up until the wilt
Does growth slow done prior
Same strain each crop?

If I was to hazard a guess based on what I know, I would expect your roots are rotten. This is usually caused by not enough oxygen in the root zone. This anaerobic condition causes disease. It seems to be happening regularly (every crop?). I've never used that food, but i would assume it's not poison.
Send more info

Lights-400 watt hps
medium- clay pelets in deep water culture
nutes-technaflora recipe for success
ph-5.9
watering schedule every 7-10 days although last night I went to check the roots and the bucket was empty and I watered 4-5 days ago so I quickly made up a mix of water but it didn't stop the leaves from wilting but it did slow it down quite a bit.... maybe it's in shock now from no water? just a guess i'm throwing out there.
Feeding rates and interval 3 quarters strength everytime I change out the bucket every 7-10 days whenever it gets low.
system is deep water culture. I'm doing sea of green with 4 plants
leaf colors are completely green but curling under. 2 out of 4 plants have leaves curling under and some of the tips are curling up and look a little dried out or burnt they fall apart in your hands.
yes they are completely healthy and vibrant until the leaves wilt.
Umm I can't tell if the growth slows it might but it happens so quickly I mean with in a day the plant is half drooped under dead looking there is not much growth that can happen.
and yes same strain each crop. except one time I had Purple Kush in soil and this happened but it was at the same time a few weeks into flowering.
I just sprayed for bugs with azamax yesterday and then a few hours later it started happening.
I hope this gives you and idea of what it could be.
I checked the roots and they look perfectly healthy I mean this wilting is only happened to 2 out of 4 plants that are in the same bucket the other 2 plants look perfectly healthy. You would think if it was a root problem that it would be happened to all the plants cuz all the plants are in one root ball inside the bucket. I turned up the air pump that goes inside the bucket to see if more oxygen would help. but I don't know.
Thanks in advanced for the help.

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  UPDATE!- I found bugs in my water reservoir so I called the local Hydroponics store and they said to add the Azamax bug killer to the water reservoir. So I did. Hopefully that will kill them and is the problem. They might be eating my roots.​
  
  
  
  

Got pics?????