Ulster Bank, part of the long-suffering Royal Bank of Scotland (RBS) group, has again been forced to grovel to customers after yet another IT failure.
The problem, lasting for 24 hours, debited some customers twice for ATM withdrawals.
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A spokesperson said: "We are aware of an issue regarding duplicate ATM transactions involving some Ulster Bank customers between 4.15pm on Easter Monday and 4.15pm Tuesday afternoon.
"We are working to correct this for affected customers and restore money to accounts tonight.
"Customers will not be left out of pocket as a result and can contact us if they require further assistance. We apologise for any inconvenience caused."
Both Ulster Bank and parent group RBS have been afflicted by glitches repeatedly in the last few months.
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By GlobalDataThe Irish unit of RBS was afflicted by a glitch on 12 December, following on the heels of a catastrophic on 2 December, Cyber Monday, when many customers were trying to make online purchases.
The Cyber Monday failure also affected RBS and NatWest, but this latest glitch appears to have only affected Northern Ireland customers.
In 2012 Ulster Bank was hit by a failure that left customers with limited access to their accounts for three weeks.
The UK’s Financial Conduct Authority is currently carrying out an investigation into the resilience of the high street banks’ IT systems.
Although RBS and Ulster Bank in Northern Ireland will almost certainly feature heavily in the findings of the investigation, other UK banks have also been impacted by similar flaws in computer systems.
Customers of Lloyds Banking Group were hit by an IT failure towards the end of January, while payday traffic caused the mobile platforms of Barclays, Santander and RBS to collapse on 28 February.
RBS and NatWest systems also collapsed on 28 March – a failure the lender again attributed to high traffic.
The regulators will report back on findings in early 2015, said the FCA.
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