Oncidium Brown/yellow roots

[Hultaren]

Hello orchidboard!

As you see, my oncidium have brown/yellow roots that feel "spongy". I feer this is from "over watering". but i only water them with 1-2 weeks in between, and sometimes i let them dry for a while. This didnt feel "okej" because my bulbs is quite wrinkeld. so i even tryed just spraying the roots every week.

So what do i do? as you can hear, I'm quite new.

Thank you in advance