Don't shock it again by re-repotting!!!
Such a reaction suggests the plant is being stressed in some way, but if the roots were in good shape when you moved it, going from sphagnum to S/H isn't much of a shock to the plant at all. Let's look elsewhere:
- Did you clean the LECA really well before use?
- How often are you watering?
- With what solution are you watering?
Conversely, if the roots were not in good shape, the plant was destined to have that reaction anyway (repotting would probably exacerbate it), so your going to need to give it a bit of better care for a while anyway.