Customers of HSBC were unable to access mobile and online banking services on Saturday, as the bank was hit by another IT failure.
The outage lasted for approximately two hours according to a spokesperson for HSBC, and has now been resolved.
The bank declined to comment on the cause of the IT problems, and was unable to rule out a systems upgrade over the weekend being at fault.
"Our online banking was unavailable for a short period of time on Saturday evening," the spokesperson said. "We worked hard to fix the issue as quickly as possible, and we apologise to any customers that were inconvenienced. Our telephone and ATM banking services were not impacted."
The bank was unable to say how many customers were affected by the problems.
Some took to Twitter to highlight problems with online and mobile banking services, including Michael Pollitt (@Pollitt), who was "unable to check balance/move cash" using its mobile app.
HSBC customers have encountered a number of problems in the past 12 months. In June 2013, the bank blamed a "mainframe outage" for an problems which affected online and ATM services. The following September online and mobile services were disrupted due to an unspecified server issue.