Santander has apologised for a “technical problem” which has been affecting its services for several hours and has stopped some customers making payments.
Some people have reported not being able to make payments online or buy food at the supermarket on Saturday.
The bank said earlier that the problems affected branch, telephone, online, app and card services.
Santander, which has 14 million active UK customers, insisted: "No-one will be out of pocket."
The bank has advised customers they can access cash from other banks’ ATMs.
It tweeted: “We’re sorry that a technical problem is affecting our services, our teams are working hard to fix it.
Have you been impacted by the issues? Email webnews@mirror.co.uk
“You can access cash from other banks’ ATMs. Please check back here for further updates.”
Twitter user Dave Chambers claimed he had been unable to buy a car because of the issues.
"I have been to buy a car for my son today, agreed a price, got the paperwork sorted, went to arrange the payment, only to find I couldn't," he tweeted.
"(I) felt a right lemon!
"There's potential to lose the car. Not good enough Santander."
Gareth Shaw, head of money at Which?, said: “These technical issues will be causing stress for many Santander customers – with people reporting that they have been unable to make online payments or in some cases purchase food in their local supermarket.
“Customers can incur fines, penalties and fees when they’re not able to access their finances, so the bank must offer compensation to all those who have been impacted in this way.
“These problems demonstrate why it is vital that banks invest to ensure their systems are up to the task of protecting their customers’ accounts and maintaining the services they rely on.”
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