I believe it is mostly because of bitcoin, the impact of bitcoin increasing its value is somehow significant in ETH and other altcoins its not severe but it still affects the overall market of ETH and every time bitcoin has a movement or improvement it is most likely that most (not all) altcoin might suffer for the reason of bitcoin changing.

The market fall of ETH won't be long though rejection is part of every coin in cryptocurrencies and it is normal for one to have some difficulties.