Sri Chinmoy: No, it is not because you meditate too much. If you are losing energy while meditating, it means that your meditation is incorrect. If you meditate well, you will gain energy, not lose it. If you do the right thing, naturally you will succeed. But if you meditate in a wrong way, then the meditation fails its own purpose.
Your meditation, unfortunately, is not the way it is supposed to be. You are supposed to meditate on the heart or on your inner being. But you are meditating on the mind or in some other wrong place. That is your problem. Meditation is the only way to gain infinite energy, infinite light and bliss. But if the particular method you use every day is wrong, then, naturally, you will lose energy instead of gaining it.