Amazon says its systems are back online again after connectivity issues persisted Monday. But reports of problems with Amazon’s cloud computing services unit AWS continue.

On DownDetector, a website that tracks online outages, users reported issues with Snapchat, Roblox, Fortnite, online broker Robinhood, the McDonald’s app and many other services.

A major outage caused by an issue at Amazon Web Services affected hundreds of websites, games and apps, including Amazon, ...