curling and drooping leaves?

hello all i am currently growing an autoflower strain and have come across some curling leaves on one plant and some drooping leaves on another..Anyone know what this could be and how to diagnose the problem...
thanks

i think if the water ph and soil ph is ok, then its just too much water or heat. im in hydro tho so all i do is turn back the water pumps

do you mist? if so it may be becasue u are misting under ur light and its frying ur leaves. I think thats what one of my girls is sayin today too. Hopefully she gets better soon.