CHARLOTTE, N.C. — Bank of America Corp. said network connections for its online banking service were fully restored to retail customers sometime Thursday night.

The company’s customers had experienced sporadic outages when trying to log in to their online bank accounts from last Tuesday through Thursday.

Eloise Hale, a B of A spokeswoman, said, “It was a network connectivity problem, and as of Friday morning the site was up and running.” The company had worked on restoring connectivity through the night.

The outages mostly affected California customers but did go farther east, said Ms. Hale.

She did not know how many customers were affected because some outages came during low-traffic times and others during higher traffic periods.

Customers who were unable to log in saw a Flash page directing them to telephone banking, where they could complete all transactions, including bill payment, Ms. Hale said. “We are going into a higher traffic time, so we are closely monitoring the system,” she said.

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