The trick (imho) is to buy only what you see locally...if you want to grow outdoors. There are certain types of orchids that don't like our heat and humidity. Your plant, however, shouldn't be among those. If it is a recent purchase, as in the last two, or three months; it may just be in shock. When a plant goes from greenhouse to store to you, or when it gets shipped...or repotted, they go into shock and with some plants it can take up to a year for them to quit "stressing", and go back to active growth. I'd suggest being patient. I have a few Cattleya that sometimes quit growing on me for over a year. Just be vigilant as these are the plants that bugs like to attack. Hang in there, when it gets used to it's new owner's care regimen it will perk up for you.