I think this may be right:

There were some rumors put out that Coinbase has a circuit breaker for its users of sorts. Meaning that any time bitcoin gets volatile it locks people out from trading so they don't do something stupid. This hasn't been verified by Coinbase but with all the outages every time bitcoin gets volatile it would make a lot of sense.

While I know it’s possible that it’s a bandwidth problem; where usage spikes above their prepaid limits and they don’t want to pay for more bandwidth everyday when they only use the extremely high bandwidth on days with volatility. But it is a very cynical posture to take to suggests that to save money they only pay for enough bandwidth to cover their customers needs the majority of the time and then just put up that error on those rare days that customer trading usage exceeds their limits to save money. And I am not that cynical yet........🤨

Hmmm.....

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