I don't think that this is something to worry about. It is ordinary market behaviour that follows some news. In couple of days or a week will be back talking about the highs we can reach.
Here's the news that is responsible for the latest downward slide in price. It isn't something unusual though because at times like this, some traders can't help hitting the sell button as pessimism replaces whatever enthusiasm there were in them. At any rate, it's nothing outside the routine up and movement of every market. Interestingly most of us can bet that it should rather be seen as yet another opportunity to buy and increase our holding at a reduced rate.
https://www.cnbc.com/2018/05/24/us-opens-criminal-probe-into-bitcoin-price-manipulation-bloomberg.html