Repotting for species Phal?

[Nicolasdperez]

Hello, my Phal tetraspis has recently lost a leaf and another one has yellowed. These two leaves were somewhat yellow when I first got the plant but recently their condition has worsened. Additionally, new roots on the top have began to die off, there is heavy deposits, and I regretfully used poor quality medium when potting it up. I was also traveling recently and had to bring it with me. That being said, it still has a healthy new growth. Should I repot? Or could this possibly be a sign of stress? Or should I just wait a while to repot? (I let it dry in between waterings which is about once every week)