Query on water reduction in borewell

Output reduction

Dear IWP

The output in my borewell has suddenly reduced. Though the pump keeps running for hours, but pumping the same amount (looks to be around 5 to 7lpm) from start till switch off . It keeps showing around 5Amps (initially it was around 5 to 7 Amps). The pump is at around 600 feet, and is of 2KW 3Phase.

What could be at fault- the pump, pipe or electrical wiring or the water level in the well?

Need your advice