its called a price spike, its been happening to a lot of coins as of late especially with the downing of nicehash its been like a roller coaster. watched a few coins on whattomine like etn go up and down in price over the last week.
I've only been doing this 5-months but I've never seen anything like this before. Every single coin is giving half, or nearly half rewards. It's like the hash power in all cryptos has doubled overnight. All algos are impacted from what I have seen.