Both TSB and HSBC’s mobile banking services have gone down, leaving customers locked out of their accounts.
It marks the second time this month that TSB customers have been left without access to their online banking accounts.
The bank’s chief executive Paul Pester stepped down after the last round of technical problems, following a prolonged outage earlier this year which left up to 1.9 million customers locked out of online banking.
A TSB spokesperson said: “We’re aware of an issue affecting some of our customers when they are using our mobile app and Internet Banking this morning. We are working hard to fix these issues and will update again as soon as we can. Customers are still able to use their cards as normal.”
Meanwhile, many HSBC customers have complained that they cannot access their cash, having been paid overnight, because the mobile app has crashed.
An HSBC UK spokesman: “Services are recovering and the majority of our customers are able to log-on now, but we are continuing to monitor the issue.
"If a customer continues to experience problems they should continue to retry or our online banking services are available via browser. We apologise for any inconvenience caused.”
Customers are receiving an error message when they try to log in on the app, which tells them "Something went wrong. Please try again later."
Earlier this week, HSBC announced an update of its app.
