Robinhood experienced its second straight daily outage during Tuesday's hectic trading session, prompting fresh backlash from clients online. Markets slipped as the day progressed as investors mulled the Federal Reserve's first emergency rate cut since the 2008 financial crisis. The discount brokerage experienced a "system-wide outage" during most of Monday's session after an infrastructure issue locked users out of their accounts. The Tuesday error restored by 11:54 a.m. ET, according to a Robinhood tweet. "Fool me twice, shame on me. I'm out," one user said on Twitter.