It is no suprise for me that the ethereum is having these pumps as it have witnessed a lot of development in the past few months, and by late 2017 and with the price of bitcoin being so hgh people have switched to ther cryptocurrencies and since ethereum was the second  in terms of the market cap, everyone saw it as an oppurtunity to make some good profit from it, i personaly have been a supporter for ethereum since it was added to blockchain wallet, and when bitcoin cash fork happend i exchagbed what i got from it to ethereum, and now i am happy for doing that as i see that i made the right decesioin.