Usually, a lot of alts are saving news for a market turnaround.

Altcoins seem to be losing momentum faster than btc (not fact just observation)

But I saw it three times that certain ALTS go the opposite way even BTC is down by 10-20 percent..

1st is Solana when it reached its $18 per SOL.
2nd Cardano, just this month.
3rd Blocknet

I'm not sure what is the factor that changes things around. Perhaps, great fundamentals as well with a lot of news in the long term.