The latest glitch resulted from an error in system settings and affected automated teller machine and online banking operations for about an hour on Thursday afternoon, a Mizuho spokesperson said.

Mizuho's technical problems this year came despite a $3.6 billion overhaul of its systems in 2019 and prompted a reprimand from the Financial Services Agency (FSA) last month.

The group's CEO, chairman and the head of the main banking unit are all stepping down by April to take responsibility for the glitches.

(Reporting by Makiko Yamazaki; Editing by Susan Fenton)