DownDetector is reporting multiple problems at a host of top online brokerage firms, including including Charles Schwab, Fidelity Investments, Vanguard, Robinhood and TD Ameritrade.The breakdown comes amid a surge of sell orders as weak market forecasts spooked investors, prompting a rush out of over-hyped market sectors, including AI and crypto.Schwab was down for more than 15,300 users while outage reports on Fidelty reached over 3,000, Downdetector showed. Robinhood, Vanguard and TD Ameritrade also suffered a rush of reports from frustrated users.