Why the top executives in Flipkart getting quit in 2016?

As we know, Flipkart is one the successful startup company which creates a big impact in the E-commerce market in India. Consecutive success makes the Flipkart been competitive with one of the E-commerce giant Amazon. Each and every year Flipkart raises its flagship in India. But the year 2016 was not as good as in the past. What would be the reason for loosing top executives in the 2016? Can members share your opinion regarding this topic?