Ok above, bad below, my Catts!

[Jeffery]

My Cattleya's that I was bragging about earlier doing so well have taken a turn for the worst, they started to drop some leafs, so I pulled 1 out and it had no roots, so I started pulling more and what roots there were, was not looking good, I can't tell if they dried out or had root rot, I am watering them good twice a week and they have good drainage, I realize it has gotten much drier and hotter here in SoCal, but I am sure they are getting enough water, can over feeding cause something like that?