Beginning of this year I see BTC and altcoins markets are higher valued. But Since Feb of this year thats markets are falling down. Its still not yet stable and i see lot of Panic seller in this period. I want to know whats the reason for it. Please give any idea

I do not hear the bad news in the current world of cryptocurrency that could affect the market situation but maybe some investors or big companies have taken over the market today. because I believe there will be some investors who can play the price, you could say "pump or dump". it has affected the current market situation.
do not panic sell because recovery is sure to happen.