It could be a number of things at a time which could have to do with negative news which is making people scared of investing. People dumping coins for their profit, whales manipulating the prices of the coins to keep them down so they can accumulate a large number of coins. it could be anything at this point. It could just be the market being volatile as always
When we talk about the price of altcoin ethier high or low it's all about the supply and demand with that altcoin can affect the price itself. If a lot of people who are buying that altcoin the demand will goes high and that's the time the price of that altcoin goes high too. But if many people are selling their altcoin the supply of that altcoin goes high so that the price itself will goes low.