Why Do Yuk Prime Ministers Not Last Long?

In the 19 nineties, indian prime ministers came and went like a merry go round. It's an inherently unstable system. The american just acquired german technology and built upon that. So did the soviets. So didThe chinese. I hope that answers your question, my good friend. Ok, two questions. By atarva, why do yuk prime ministers not last long? Is it because of intra party democracy, which is absent in indian parties? How much power does the crown hold? Do bureaucrats ron the country?