Customers of Royal Bank of Scotland (RBS) and Lloyds Banking Group were unable to access mobile banking services due to some glitch for around six hours on 23 May 2014.
Tendering an apology to customers, RBS said that all services have been resorted and running as normal.
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This is the second such incident in two months when the UK bank suffered from technical problems. Earlier in March, its customers trying to check their pay-in their accounts were locked out.
RBS Group said customers of its brands NatWest, Royal Bank of Scotland and Ulster Bank had problems logging into its mobile banking app for around six hours.
Separately, Lloyds said a "small number" of Lloyds, Halifax and Bank of Scotland customers had trouble accessing payments on the same day.
The Lloyds issue related to telephone and internet banking only and lasted for around an hour and-a-half.
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By GlobalDataA Lloyds spokesman said, "We are aware that a small number of customers experienced issues accessing payments this morning."
"The issue has now been rectified and we are working with those customers who were affected."
