Network problems at Internet backbone provider Level 3 have caused some intermittent connectivity problems today for customers of several U.S. access providers. The issue appears to be related to network integration of Wiltel Communications, which was acquired by Level 3 last fall. By late afternoon, East Coast time, Level 3 was reporting that the situation had been stabilized. Level 3 is one of the largest providers of wholesale dial-up service to ISPs in North America and is the primary provider of Internet connectivity for millions of broadband subscribers through its cable and DSL partners.