As cryptocurrency markets plunge, crypto exchange Coinbase's (COIN) platform falters.Coinbase's status page says its platforms are experiencing "intermittent downtime" and it's investigating the issue.Reports on Coinbase outages jumped to 2,884 at 9:05 AM, Downdetector says.Meanwhile, Coinbase users say they're trying to buy on the dip but keep getting error on the app or website, according to posts on Twitter.Bitcoin falls 23% to ~$33.5K and ether sinks 31% to $2,302.Coinbase shares drop 10% in premarket trading.