Robinhood, TDAmeritrade, and other online stock-trading platforms all experienced issues on Monday

A pedestrian walks by a TD Ameritrade office on November 25, 2019 in San Francisco, California.
Justin Sullivan/Getty ImagesRobinhood, TDAmeritrade, Schwab, and Vanguard all experienced issues on Monday.In many instances, users reported problems logging into their accounts, placing trades, or having them executed. Short outages are typical, though a sustained, industry-wide issue is rare. Also on Monday, Bloomberg reported Robinhood was being investigated by US authorities over an out