Ethereum flash crashes to 13$ and jumps right back up.

Ethereum flash crashed this afternoon and plunged to 13$ and went directly back up to 295$. I completely missed it because the wallet I buy through, coinbase, was overwhelmed with traffic and is still shut down. Does anyone know a more stable wallet to buy through that doesn't get overwhelmed when there are major market crashes like this? I use poloniex to trade but don't always have my computer on me to capitalize on these drops in real time.

https://www.google.com/amp/s/amp.businessinsider.com/ethereum-price-flash-crash-2017-6