My guess would be that repotting might help, as things from florists tend to be at their peak when you get them. Everything I've ever gotten has died if I didn't repot it fairly soon.
Mine NEVER suffers from overwatering! Poor thing has to practically die before I get around to watering it.
Confidence is that feeling you have right before you do something really stupid.
Poor thing has to practically die before I get around to watering it. 
