Binance, Coinbase, Gemini and Kraken are all having technical difficulties
under heavy trading load.
Spillover from market drama on Wall Street is crippling U.S. exchanges.
The financial regulator ordered the Bitkub exchange to close and fix issues
that caused several outages as prices spiked this month.
The exchange also said it's working to improve its customer service response
time, another source of complaints.