Bitcoin’s price has been up and down today, swinging wildly from its more than $4,400 high to about $3,900, before it rose again.

The cryptocurrency is back over $4,000 at the time of this reporting, at around 11:30 am ET, hovering at about $4,025, after previously dropping more than $500 in value down to about $3,929.

That price followed a high this morning of $4,483.

The currency is not the only crypto experiencing some turbulence today; according to CoinMarketCap, nearly all of the top 10 cryptocurrencies in the market are down (with the exception of Dashcoin for some reason, which is up 2%).

The reason for this fluctuation is unclear — even for bitcoin, this sharp rise and fall all in a few hours is a little strange — but it certainly bears watching.

Read more: Coindesk, Business Insider, and CNBC.