Robinhood's app. - gguy/Shutterstock It looks like trading platform Robinhood may not have been fully prepared for SpaceX IPO Day. Shortly after shares of Elon Musk's rocketship/AI/social media company began trading publicly, users started reporting issues with the brokerage service, according toThe Wall Street Journal. Reports of disruptions spiked Friday morning on downdetetcor.com, a website that monitors service outages, peaking at more than 5,500 reports.