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The concentration of wealth by few wallets.
There are currently 11 wallets without outbound payments since 2014, holding a total of 273,182 BTC.
As soon as one of these ‘whales’ (large holders) sell their Bitcoins, the price will decline firmly. It happened before. This will trigger bots to sell more, plummeting the rates even more.
Some of these wallets might be inaccessible. Or the holders are waiting for the right moment to manipulate the rates?
Nobody knows.
I don't believe the wallets are inaccessible. Perhaps the owners are waiting for the right time, or those coins are just left as idle money that the owners have forgotten for now.