Plant wilting after 3 weeks of flower and no cure??

This plant wilted today all of sudden and its been flowering for 3 weeks in a passive half soil hydroponics system. The same problem also occured for few other plants that were in vegetative state and so far I did not find any cure for it. The only reason I can think of right now is overwatering but I took the plant out of the pot to expose the root to some fresh air but still no help. Anyone had this problem before? please help I don't want this plant to die...

looks over watered. dont expose the roots to light thats bad for them to. just let the soil get completely dry b4 watering again

godspeed my friend