Orchid dropping buds

[kyredhead]

Hi every body, I am still having trouble with my Dendrobium Orchid.
I posted the problem to the forum a few weeks ago about it's
flower buds simply drying up and falling off. A suggestion was
made that there might not be enough moisture in the air. So I
set up a humidifier. There was no change in the Orchid. So I set up
a second humidifier and the buds are still drying up and falling off.
However it is making 2 new flower stalks and the buds are beginning
to form on the 2 new stalks. If anyone has any other ideas I would
appreciate hearing them. I would love to solve the problem before
the buds on the 2 new stalks start falling off too.
I am watering it twice a week. It is not in direct sun. I appreciate any
good ideas you can share.