Clone trouble

I have been having a little trouble cloneing. I have a 20 sight areo ponic cloner and have used it succesfully many times. My system is set up with two rooms one flower and one clone and veg. Each time I move a batch of plants from my veg room to my clone room I clone the plants and start the cycle over. I was wandering is there only so many times you can clone from clones or is my problem somthing else. I am still able to root clones but it seems to be taking longer and my succes ratio is less. Plus the clones just dont look heathy in the cloner. I am on my 5th generation. When I first started I had the plants in the cloner for two weeks then three weeks veg then to the flowering room for eight to nine weeks. now it is taking three weeks and sometimes more befor I can get enough roots to transplant. I am useing power clone in the cloner.

Mother should be grown from seed every year, for their genetic intergity begins to decline. MJ is an annual plant, being its life cycle in nature is one season, though growers have maintained mothers longer. Remember, clones aren't just a couple of weeks old, but they are as old as the mother. Remember to allow mothers to rest in between cloning, flush mothers for several days before taking cuttings or foliar flush nitrogen out of would be cuttings. Would be cuttings should be flexible, confirming low nitrogen and high carbohydrates to insure good rooting. Older lower branches contain more carbohydrates.