Honestly Mike. You're asking a very broad question.
There are so many factors that can affect the health of SPS. Lighting, water parameters, temp, salinity and swings in anything. The trick I found with SPS is consistency. If you have everything bang on one day and don't dose for a week, then start dosing again. That alone can kill sps. Stability is key.
This is my first go at SPS as well. I've lost my fair share of frags. Weather it be my error or possibly shipping or fragging techniques from the seller. It's always a gamble. The one thing I've found to help with my success in keeping SPS is stability. Now that I'm on daily dosing and monitoring temp and salinity swings daily. I'm finding that my SPS are doing much better. Growth and color. Even though I've had my tank "stable" for at least the past three months. I still seem to lose SPS from time to time. Which says it can be more than what I mentioned above. Could be water flow, fish causing stress on the coral, inverts disturbing it, and the list goes on.
All SPS guys will tell you SPS are always a gamble.
Good luck with your future attempts.
Also posting more info about your tank may help us pin point a problem. But like I said, it could be a number of different things.