Fidelity’s website and the Robinhood app crashed for some users Monday, while panicky investors fled a stock market with inflated multiples. DownDetector reported a surge in problem reports for these stock trading platforms. The Dow Jones plummeted 3% at the opening bell. Meanwhile, the Washington Post started a wild YouTube live stream that lets you watch the DJI stock ticker go down. Stock trading platforms like Fidelity and Robinhood suffered a bout of unwelcome problems on Monday. Panicky investors logged in to find they couldn’t run from a plunging stock…