Onc. Tsiku marguerite 'NN1' flowers fell off

[edy50dr]

Hi Everyone,
Just registered here. Received a Phal as a gift 3 years ago; it re-bloomed last year. Went to the NYBG orchid show last year and got bit bad with the orchid bug. LOL
Now have 8 various orchids.
Problem: Bought the orchid in my forum title 2 weeks ago at an orchid show. It has 2 branches and one of them was blooming. All the blooms fell off, the last fell off today. I am wondering if my home is too cold right now. 60-61 degrees at night and 64 during the day. I have watered it 3 times in 2 weeks and fed it twice weakly. I think it gets enough light, though it has been cloudy for several days.
It is on a tall plant stand along with the others and the stand is about 3 feet away from patio doors with atrium skylights on top. I am wondering if this orchid is better suited for my office which can be much warmer.