TSB and HSBC (LON: HSBA) are the latest banks to experience an IT glitch, leaving customers locked out of online banking.

HSBC said about 50 percent of mobile users were having trouble connecting. It is the second time this month TSB users have experienced difficulty.

“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,” said a TSB spokesperson.

After the most recent round of technical problems, TSB chief executive Paul Pester stepped down.

TSB chairman Richard Meddings is taking on the role of executive chairman until a new chief executive is appointed.

Meddings said: “Although there is more to do to achieve full stability for customers, the bank’s IT systems and services are much improved since the IT migration. Paul and the Board have therefore agreed that this is the right time to appoint a new CEO for TSB.”

Last week, RBS (LON: RBS), NatWest and Ulster Bank also reported problems with the banking apps, leaving customers locked out of accounts for five hours.

An HSBC UK spokesman said of the glitch: “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.”