All of this. There are plenty of reasons and it happens in other forms of investment too. Things grow, they reach a tipping point, they 'correct' when selling starts to happen and it somewhat snowballs due to fear, bots etc. and then it starts rising again. It's nothing to worry about. It's natural to worry a bit when an investment falls quite sharply, but a correction is actually healthy for long term growth - without periodic corrections, you'll see a bubble which bursts and many people get wrecked.