Mormodes and shriveling bulb prevention?

[Aceetobe]

Soooooooo....like all of you, we all notice the Mormodes during the winter along with the rest of the Catasetinae can fall prone to the back bulbs turning yellow and shriveling. I understand this is common - but at the same time, I don't notice this happening in natural environments as often.

I know the standard advice is to divide often to prevent the shriveling. But I've received Mormodes in trades before that had a healthy 4-5 bulbs or so - which promptly lose their backbulbs in my care.

I maintained my Mormodes horichii with 3 bulbs until this winter - and now it looks like its going down to one - the blooming bulb

Any clue what can be done to prevent this?

Is it humidity? Temperature? Lack of water?

I think maybe I'll maintain a Mormodes in S/H over next winter and keep it wet to see if I lose the backbulbs.