Temporary dips are very common in bull runs, that's the way the market works. After a big run there is always a small correction, and after that comes the next run. Don't be afraid and hodl your coins.
Yes, bitcoin price was not stable, it was volatile means that it was an ups and down on its price. Mostly after a big dump there are many users who do panic selling. Most of them are newbies because they have lack of knowledge yet about bitcoin price, but for those who used it for almost a year they continue holding because they know that it will recover soon.