"Like many other companies, Target uses NCR as a vendor to help accept payments, and on Sunday afternoon NCR experienced an issue at one of their data centers," Target said.
NCR could not be reached for comment Sunday evening.
Target also acknowledged its customers' weekend ordeals in a short apology.
"We know many guests had a frustrating shopping experience in our stores this weekend," Target said. "For that, we are truly sorry."
The latest outage did not go unnoticed online.
Target said Sunday's incident was unrelated to Saturday's issue. The company has 1,800 locations in the United States and a presence in India.