Keiki leaves on stem are drooping!

[OhMyOrchid]

Hi!

I've had this orchid for a few years now. A few weeks ago, all the leaves suddenly turned yellow and fell off, exept for one. I replanted the orchid as the roots were clearly struggling.

This plant has two keikis on the stem, both with 4+ leaves and 3+ roots, although the roots are around 3 - 4 cm (1.2 -1.6 inches) at most. After the last repotting the largest keiki leaves have started to droop a little and I'm getting worried that they will die - the stem has also started to brown and is reaching the top keiki. I'm too scared to repot them because the roots aren't 5 cm (2 inches) yet, but don't really know what to do. Should I risk repotting them or risk further drooping?