If you want to be able to trade on demand, then you should put the tokens you want to trade in a wallet on an exchange. Coinbase isn't meant to handle huge spikes in trading activity like Poloniex or Bittrex are, but I'm assuming that many people choose to trade on Coinbase due to convenience.
I use Bittrex and Coinbase but this was the last straw for Coinbase. Thanks for commenting .
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