Gifts don't go away, they are apart of us. Sometimes we can mentally push them away, but if you use them, don't have a fear of them or deny them, then there is no reason to think they are fading for this reason. However, factors like stress, depression, lack of sleep, and illness can cause gifts to seem like they have faded. This is not always the case, it depends from person to person. When I was pregnant with my daughter, my empathy felt "shut off" for the first and only time in my life. It went back to normal a few days after she was born. It was eight long months of feeling "blind" in a way.
Reflect and consider what is going in your life mentally, emotionally, or biologically that has changed and work through that first. Medications/drugs can effect this as well. Don't fight the symptoms (in this case disappearance of spiritual senses), cure the problem.