I'm a first time Adenium keeper and I've only had mine for about 6 months now. I haven't run into any issues yet.
One thing I try to remember is that the soil must be completely dry, top to bottom, before I water my Adeniums. Since mine are currently in clay pots, it is pretty easy to get a sense of the moisture in the soil and they tend to dry out faster.
Before the rainy season hit, I was watering about once a week. Now, its been a while since I've seen dry soil and I haven't watered them in about a month.