Water from borewell in Tirunelveli, Tamilnadu, suddenly stops after 8 mins without any decrease in flow - Why does this happen?

We have a borewell of 70 feet depth in Tirunelveli, Tamilnadu. It was drilled in 1985 and there has been no problems with water supply till few days back. It runs continuously for upto 30 minutes with no problems, but now it pumps water only for 8 minutes and water suddenly stops without any decrease in flow.

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