X, the social media app with more than 600 million users, suffered periodic malfunctions worldwide Monday. Service had restored to most users after 1 p.m. EDT, according to Downdetector.com, a website that tracks interruptions in service for sites.

According to outage tracking website Downdetector.com, in the first incident there were more than than 21,000 incidents of people in the U.S. reporting issues with the platform and 10,800 in the U.K. The platform appeared to be back to normal around 2.30 a.m. PT. In total, X was down for roughly 45 minutes.