I believe this was due to several factors. The first factor is simply someone, perhaps the miners, put ETH up for sale and some of the big players bought this ETH. The second factor, someone wanted to buy ETH at a price lower than it was at that time, and for this the price was artificially lowered, and after that the buyer bought ETH. The third factor that can influence the fall in the price of ETH is simply a correction in the crypto market, especially since prices have dropped for other top cryptocurrencies as well.