drooping leaves

Hey guys, First time grower here. I am growing lemon haze og auto. One plant, indoors in soil. The plant was all good and healthy through its vegetation state. 2 1/2 weeks into the flowering stage in the time 12hours the leaves just drooped. Like overnight !! I unearthed a bit of soil to check...

I have an outdoor plant (Chem Dawg #4) which is in the second week of flowering and i just noticed that the fan leaves have started to droop (almost overnight). I've uploaded a pic of the plant on Tuesday of this week and another pic taken today (3 days later). *last watering + bloom nutes was...