I have heard that since coinbase keeps all but 2% of their crypto assets in "cold storage" (offline storage that requires a physical trip to somewhere to spend)

I have heard that since coinbase keeps all but 2% of their crypto assets in "cold storage" (offline storage that requires a physical trip to somewhere to spend), there are semi-frequent times where their "hot wallet" runs out of money, and they need to go and retrieve it from cold storage in order to continue. Naturally this would happen when there are large spikes in usage (which happen during swings in price) and people are trying to move cryptocurrencies out of coinbase.