Your orchid has a strong Dendrobium phalaenopsis influence, hence the nickname Phal. type Dendrobiums.

Maybe warmth isn't your problem at this time of year because no doubt the plant is indoors....but it certainly is here in winter where i have similar orchids growing in a glasshouse and i'm a bit mean with the heating. Cold and damp is the usual reason for buds dropping off.

Maybe you would have success if the plant was grown under lights.

Pity most of these orchids "decide" to flower in winter.