System failures at McDonald’s were reported worldwide Friday, shuttering some restaurants for hours and leading to social media complaints from customers, in what the fast food chain called a “technology outage” that was being fixed.

Chicago-based McDonald’s Corp. said the problems were not related to a cybersecurity issue.

“We are aware of a technology outage, which impacted our restaurants; the issue is now being resolved,” the burger giant said in a statement. “We thank customers for their patience and apologize for any inconvenience this may have caused.”

Earlier, McDonald’s in Japan posted on X, formerly Twitter, that “operations are temporarily out at many of our stores nationwide,” calling it “a system failure.”

The website Downdetector also reported a spike in problems with the McDonald’s app in the last few hours.

Some McDonald’s restaurants were working normally again after the outage, with people ordering and getting their food at locations in Bangkok, Milan and London.