It is quite common for the intensity of aspiration to somewhat fade over a period of time. It is partly because the fire naturally touches the other layers that are not so open and receptive and tends to obscure it. This is especially true of the physical consciousness that tends to obscure the flame. That is one reason why the Mother was so keen on awakening the latent body consciousness. This is one of the difficulties as physical age catches up.
Secondly, and I think this is possibly one of the reasons, is that some of us who are moved by the urge to help unwittingly take in a lot of things from others and that affects us in number of ways including the dulling of aspiration.
What helps most is utter abandon and surrender to the Mother, a giving up of oneself completely to Her, offering oneself to Her and leaving everything, including the charge of sadhana in Her hands. Another thing that helps is a daily reading of Savitri and Prayers and Meditations as well as writing a Prayer everyday and as and when one feels inspired. A little bit of isolation for some time also helps. I am sure She knows Her child and Her Love is always with you. This is a phase that will pass away.
Affectionately,
Alok Da
