Some TSB buyers could not entry online banking products and services on Monday.
Consumers on the two the application and the web page gained mistake messages when trying to access their accounts.
There are dozens of remarks on social media declaring afflicted shoppers ended up not able to get earlier the stability issues, some for several several hours.
The financial institution reported it was operating to correct the difficulty as promptly as probable, and that only a “incredibly modest number” of men and women ended up afflicted.
A range of end users described their accounts had been blocked when striving to log in with the appropriate details.
Others complained that they could not obtain assist for this problem around the cell phone or by means of Twitter.
It was also instructed that the complications had began more than the weekend.
A TSB spokesperson told the Moneysaving Professional website:
“We’re aware a quite little number of buyers have been suffering from issues accessing their world wide web banking nowadays.
“We’re operating to take care of this for them as promptly as possible and apologise for any inconvenience prompted. Our mobile banking application continues to be absolutely performing.”
It is unclear how lots of buyers were afflicted by this problem but it comes just months after an outage in April influenced hundreds of users.
And final yr, a “processing error” meant wages and other payments had been not paid out into some TSB customers’ accounts.
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In April 2018, a similar IT failure still left up to 1.9 million TSB customers not able to financial institution on-line for various months.
Prospects were moved on to a new procedure, but an investigation uncovered it experienced not been tested correctly in advance of going dwell. It cost TSB a full of £330m for customer compensation, fraud losses and other expenditures.