One of the things in the crypto world is that it is unpredictable when news can affect a market positively or negatively. In the case of altcoins, the volatile nature is high when compared to Bitcoin, in that unfriendly practices or changes from the team can cause the token to drop in value; imagine a good project announcing that it will list on another exchange, of course users will want to buy and hold prior till then but what will happen if it is delayed, there are chances the token will drop in value. In addition, Bitcoin also affects altcoins, in this case when Bitcoin is rising in price most might be forced to sell off their altcoins to Bitcoin which also affect the altcoin in question. So, there are many things which affects altcoins and its price, and they might likely not be avoided.