Clones gone wrong

This is the third batch of clones I've done and they won't root. They keep wilting and going yellow. I've done everything to try and make it work. Temp is good and it's moist in the domes. Are they burning or drowning?
This is my third year growing and have never had this problem? Any advice would be great.

can i ask what kind of cloner you are using? is it one of those jiffy-soils with the dome over it, or an ez-cloner type setup?

I use to do it in rockwool cubes had great success at times, but nothing like my ezcloner. So hopefully I can be helpful...
I have few questions; What med R u using? rooting gel, powder, etc.?( I use root-tech gel) even with ezcloner.
soaking the med in clonex solution & PHing it @5.5-6.0? & slightly draining the excess moisture out so not too wet? (I used a seedling heat mat on timer but that is optional.) After cutting do u place in dark 24hrs, then place under light for 24 hrs? Are you wiping out the domes daily?
After approx a week I foliar spray with Jump start by Advance nut.. And u probably already know how to cut them, but if not, there r great videos that r helpful.
Your not alone I have had some problems in the past. I learned the hard way. I also Clear water my mother plants two days prior to remove any nutes...like nitrogen. So they can concentrate on rooting.
Opps more than a few LOL. Peace & happy growing.

i use a jar of water with an air stone in it for cloning...nothing else

no powders, no nutes...

perhaps you are taking your cuttings wrong?