Water not drawn continuously from borewell, there is a gap of about 6-7 seconds between each drawing - What is the problem?

Hello all.

We have installed a borewell (jet) for home needs in the year 1999. Later in the year 2010 we have changed it to submersible pump. It was drawing good amount of water filling a 1000 tank in about 20 mins. For the past few days we have observed that the water is not being drawn continuously, there is a gap of about 6-7 seconds between each drawing. Can u tell what the problem is?  

Thank a lot in advance!

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