Thanks for all the replies. I think it's a Dendrobium Firebird (after seeing photos on the net). I was under the impression that it was bought from a specialist who knew the best medium and pot, but not necessarily so. The medium is packed and covered with some sort of moss (the seller said it's healthy for the plant) but I read in various places that it likes airy medium. I will try to save the keikis.
p.s. I apologize for the extreme inconvenience caused by the orientation of one photo.
It looks fine on the computer and this forum does not preview before loading.