As cryptocurrencies drop, Coinbase Global (COIN -3.9%) reports that transactions are "currently delayed or cancelled at elevated rates and our apps may be experiencing errors." The operator of the crypto exchange app said it's investigating the issue and will provide updates as it knows more. According to CoinMarketCap, bitcoin volume of $60.7B over the past 24 hours is up 66%. The increased crypto activity and slump in prices come as El Salvador's move to make bitcoin legal tender takes effect.