Dies or wilts? Huge difference. I have yet to see any clone or plant die in 5 hours unless completely left out of water / cloning medium. Did you cut the stem at a 45 degree angle before applying the rooting gel? Do you have the clones under a dome for humidity? Did you cut the leaves in 1/2 so their is less surface area for respiration? You need to provide much more information and perhaps some pictures if you would like precise help.

GTD