Mizuho Bank said a system failure prevented some corporate customers from using online banking services Monday, the latest in a series of problems at the major Japanese bank since last year that have led financial authorities to order it to improve operations.

The system failure occurred around 9:30 a.m., with affected companies asked to use bank counters and ATMs instead, the banking arm of Mizuho Financial Group Inc. said. The system was restored around noon.

The bank last experienced a system failure in January when online services for corporate customers were disrupted.

Mizuho Financial has been forced to focus resources on fixing the issues and taking preventive measures.

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