I have got this one from MarketWatch:
Disruptions reported at multiple brokerages as GameStop, AMC surge
Disruptions were reported at several major retail brokerages Wednesday morning, following the speculative surge of interest in companies including GameStop  and AMC Entertainment , as well as a big drop in the major stock-market indexes including the S&P 500 . The website Downdetector reported disruptions to TD Ameritrade, Robinhood, E-trade, Charles Schwab, Fidelity Investments, Interactive Brokers and Vanguard, as well as the Reddit message board that has triggered much of the activity