If your roots are"dried up"...too little water. Now aerial roots can dry up..., and roots under the mix can be rotten. What medium is it growing in ? If it is in moss or a peat based mix, once a week might be too much water. Unpot and see if it has green ,white firm roots or if they are brown and squishy(too much water) .....if they are brown and dry under the mix then too little water.
I was given a Hilo Lip phal last spring...wimpy ,limp leaves(plant had rotten roots...I repotted and within 2 weeks ,it didn't look like the same plant...previous owner thought I had bought one...said the leaves don't usually recover once limp.... Don't give up ,but do repot ,and give it some TLC. Good Luck !