This can't be avoided because they're in the same encryption market. Most coins fluctuate with the price of Bitcoins.
For me the biggest problem of altcoins is they keep defeating Bitcoin and they're all depend to Bitcoin. Some altcoins incorporate interesting new ideas, but there is an essential feature of Bitcoin which they all lack. And since Bitcoin has a market larger by a wide margin than all the markets of all the altcoins put together, and this makes it vastly more useful as a currency. Also the other problem is some of Altcoin nowadays is no longer around or scam.