There seems no specific reason to say but I suspect that it might be due to the dumping of bitcoins by huge whales.
no one can explain the reason for it all that causes Bitcoin to continue falling, but we have to think positively and believe that Bitcoin will not always fall and will definitely rise again later even though the big whales throw it away.
I've read that exchange in south korea burglarized last week, and suffered a loss of about $50 million, is that true? because I have not got the official link, so do not know the certainty of the news