Orchids do love sun. At least mine. I tend to move them from the direct sunlight (as recommended) but they disagree. 🙂
However, I thing I found the perfect spot for them (they keep blooming since I moved them): a window sill where the sunlight is filtered by the trees. Sunny and warm during the cold seasons, shady and cool during summer.
Maybe yours needs a pot change? Or some fertiliser?