Long stems falling over.

I have 13 marijuana plants. 5 of them are about 2inches long and they fell over. I had a few of them fall over and at the dirt they would die and break off and die down there but the rest be alive for a while. its good dirt and they get watered about 3 times a day if the dirt is kinda dry.

I just don't know what to do. anyone have any idea if so please help me out.

Gonna need some more info to help

Environment.
Lights
temps
RH
Medium

Distance from lights

Or some pics of your setup to see.

could be over watering
could be LIghts too far away and stretching
Could be stem rot

Need more info please as much as you can specify maybe with a pic?

J