Psychopsis Mendenhall root tips dying off

[sewagner86]

Need some advice. I have a psychopsis Mendenhall that I have had for maybe 8 or 9 months. It was gifted to me by a friend. It was bought from Seattle Orchids as one of their as is plants. I have cleaned it up by taking off old, squishy psuedobulbs and cleaned up the dead, squishy roots. It's been potted up in this pot undisturbed except for watering and fertilizing. I am trying to figure out why the newer root tips are withering up on me. I haven't fertilized it for a few weeks thinking maybe I could be burning roots (although I typically fertilize weakly). I have a small seedling psychopsis that is doing amazingly well. Growing roots and thriving....treated the same way for watering and fertilizing. Any suggestions to troubleshoot?