Bitcoin prices are moving wildly this week. Much negative news related to the regulation of bitcoin. This affects the psychological level in limiting safe prices for trading, so many make a sell-off to maintain the security of their assets. Besides that, I think it also has something to do with the BCH hardfork. I don't know, the news circulating is very influential.
I agree with that some BCH civil war are affecting the market, SEC investigation into Project that issuing securities trough ICO, NVidia and AMD reported a steep decline in sales related to Crypto Equipment. That is some bad news that make bloodbath market at thid moment.