From what I've heard, both Coinbase and Kraken suffered outages which contributed to the correction. With much of the "new money" using these exchanges for market entry, Coinbase and Kraken will need to invest heavily in scaling their operations to meet demand. Throw into the mix, Visa and MasterCard fees pricing out Shapeshift and Changelly during the run, many critical weakpoints were exposed. These are growing pains, and how crypto responds will be very telling, in terms of how the market views its future. Will cryptocurrency stand on its own or serve as a surrogate to fiat?