Q.Black Rose Succulent

I purchased 2-4 year old black rose succulent plants from the nursery and was told not to over water the plants and they would be fine in a shaded area. I watered the plants once per week. About three weeks ago, I noticed the plants losing their leaves, then the leaves started to droop. I extended the waterings to every 10 days. Now the stems are turning green below the flower itself and the leaves are completely wilty and droopy. I moved the plants to full sun three days ago. What am I doing wrong? Live in Phoenix, AZ.