How has the watering and soil been for the last month or so, is it staying too wet?
I’m still trying to work these out too.
A couple of weeks ago I root trimmed - about 1/4 off - and repotted a few and they seem to be ok, a tiny bit of brown at a few tips but otherwise ok. I’m giving away potting them in hotter weather as my experience is they dry out and up moving on to a ‘better place’.

I do have one (not repotted) that was looking a bit lacklustre with the soil holding too much water. Kept the water back until just damp which seems to have helped.
Fingers crossed with your one.