Many government ban bitcoin because of their own agendas. Bitcoin is a decentralised currency which means it doesn't comes under control of government term and conditions which is one of the main reason behind this topic. No government never want something in their country which they cannot control. In some country Bitcoin affects their country economy and financial growth by directly affect their country own currency. And some time it involves in criminal activities. These are some reason behind government against it and this thing ULTIMATELY affects price of Bitcoin. Bitcoin irregularities in production and distribution is one if the main reason behind its falling price agenda. Sometimes negative news spread all over the social sites and tv channel by media is also reason.