I have heard of this before, and experienced it many times. It is when the sense of spiritual connection disappears. There is a loss of connection and a spiritual ‘dryness’ continues, for days, weeks, or even months. Pray, meditation and even ritual make no difference. I believe that this is what is known as the dark night of the soul. Many a practitioner will have encountered it. Doubt reigns supreme and no matter what you do, God seems to have deserted you. This is what is happening to me at the moment.
No matter what I do, I feel disconnected. I pray… nothing. I meditate… nothing. I burn incense and energetically cleanse the room… nothing. Yet I am not despondent, I have been here before and know that it is a temporary situation. My advice is to continue with your prayers and practices, even thought they feel fruitless. Eventually God will seem to return, even though he never left you. Faith is the best encouragement here and something to keep close to your heart. God will return, like I said, even though he never left.