Popular online stock trading app Robinhood Market Inc. was down today on a day when markets rallied following their coronavirus-inspired plunge last week.

Why the app was offline is unknown, but it affected all Robinhood users, including iOS, Android and web apps starting Monday morning and extending through the entire trading day. Of all the days for Robinhood to go down, today was the very worst: The Dow Jones Industrial Average had its biggest daily point increase in its entire history.

“We are experiencing a system-wide outage. We are working to resolve this issue as soon as possible,” the company initially said in a message to clients Monday. That system-wide outage extended the whole trading day, with Robinhood posting on Twitter at 4:07 p.m. EST that “we are still experiencing system-wide issues. Our team is continuing to work to resolve this and we’ll provide updates as they become available.” New York Stock Exchange and Nasdaq trading hours are 9:30 a.m. to 4 p.m.

Robinhood users were not only unimpressed but furious and many claimed to have lost thousands of dollars due to the outage.

Cannot believe this, lost 2K in one day because my money and stocks are frozen!!!!

— Haiyang Kong (@conhy3) March 3, 2020

So u automatically sold my calls when the market closed in the original price. What about my 7k profits? Answer my question. You guys ruined my money pic.twitter.com/TWZmjLfJKj

— Bingyu (@Bingyu16216456) March 3, 2020

Wow. Never thought I would see the day. Had to file a complaint with @FINRA over @RobinhoodApp what a sad day indeed. I’m still curious as to how they will make it up to the user base. @AskRobinhood @RobinhoodSnacks any idea guys?

— Daniel Snyder (@DeanGatsby) March 3, 2020

Robinhood was not alone in having difficulties during a record breaking day of trading. Pymnts reported that both Fidelity and Charles Schwab also had difficulties during the day, going on to note that higher-than-average trading volumes could be potentially to blame.

Whatever the reason, the outage is not a good look for a startup rumored to be readying an initial public offering in the near future. Robinhood has been well-supported with venture capital, having raised $323 million in funding on a $7.6 billion valuation in July, possibly its last round pre-IPO and taking its amount of funding raised to $862 million.

Robinhood hasn’t been without drama, however. In November, users found a glitch in its app that gave them the ability to trade stocks with excess borrowed funds. One person claimed that the so-called “infinite money cheat code” showed he had a $1 million position funded by a $4,000 deposit, while another claimed to have accessed $50,000 on Robinhood for free.

Photo: Robinhood