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NEW YORK (CNNMoney) — Time Warner Cable, one of the nation’s largest cable and broadband providers, suffered an unusual nationwide Internet outage early Wednesday morning, sparking new complaints about the company’s service.

Time Warner Cable said the outage occurred at 4:30 a.m. ET “during our routine network maintenance.”

“An issue with our Internet backbone created disruption with our Internet and On Demand services,” the company said in a statement.

“As of 6 a.m. ET, services were largely restored as updates continue to bring all customers back online,” the company added.

Some Time Warner Cable customers said in tweets that their Internet service was still spotty after 7 a.m., though it had resumed working for others, including this reporter, who’s filing his story via the provider’s Internet connection.

The outage is another black eye for Time Warner Cable, which has about 12 million subscribers in big cities across the country, and which has a dismal reputation among consumers.

Earlier this year, the American Consumer Satisfaction Index showed Time Warner Cable had the lowest satisfaction rate of any big television provider.