Customers of RBS and Natwest are unable to access mobile banking services on Friday morning, after a recurrence of problems on pay day.
The bank apologised for the systems outage in response to complaints from customers on Twitter.
“We’re aware of some issues on our Mobile Banking service and are working hard to fix them. Sorry and thanks for your patience,” the bank said from its official Twitter account.
The bank is now redirecting customers to its online banking services, while other systems such as its ATM network are not believed to be affected.
An RBS spokesperson was unable to provide additional information at this point.
The outage follows similar problems which occurred on pay day in February, when customers of a number of high street banks reported problems with mobile banking services. A number of these lenders, including RBS, Barclays and Santander, claimed that unexpectedly high demand had caused systems to crash, as many customers checked account balances after being paid.
Use of mobile banking services in the UK has doubled in the past 12 months, according to the British Banker's Association, and earlier this month RBS said that it had seen the largest number of banking app logins in a week, at just under 17.4 million.
Banks claim that the increase in digital banking has resulted in less footfall in branches, with Barclays and RBS announcing that they will reduce their physical presence on the high street and cut frontline staff.