Den species leafless for a long time

[u bada]

I think I may give up on den species because they keep doing this thing where they lose their leaves and then remain in limbo for months not doing anything.

Den. Lamyaiae lost it's leaves probably last spring or maybe summer and has been leafless with green pbs for 5-6 months. I started watering again like regular in last 2 months and nothing...

Den. christynaum, same thing and posted about it before.

A couple den. moniliforme's doing the same thing, but maybe they're on schedule to regrow soon... I keep those watered regularly through in winter.

Den. biggibum, lost it's leaves but has a lead pb with 2x leaves that are ok but have not budged for months, some roots started to grow and haven't grown at all for a few weeks. This had been inside during winter, watering regularly with brassavola grandiflora.

Den. parvulum which is in a growing case, same thing.

Den. thaionanthum, same thing. no leaves just pbs, although the green on this one and last noted are sadly fading... and both in growing case, regular water, high humidity.

#$%^.

let me know what you think.