Customers of a string of major banks have found themselves locked out of mobile banking amid high surges of traffic as people checked their pay.
Royal Bank of Scotland (RBS), which includes NatWest, said it had seen "record" numbers of people trying to access its app in the run-up to the weekend, as many have their wages paid in at this time of the month.
Barclays and Santander also reported problems with mobile banking. All of the banks said their other services were working as normal.
Customers vented their annoyance on Twitter. One frustrated Barclays customer said: "Whhhhyyyy isn't the £barclays app working. I have no idea if I've been paid or not. It's driving me mental."
Another wrote: "PAYDAY! The one day I want to use your app and it's not working! Sort it out Barclays!"
A NatWest customer wrote "natwest app isn't working! It's either not even loading or taking forever to log me in!"
RBS apologised to customers on Twitter, saying "high traffic" was preventing some customers from being able to log in. It said: "We are currently experiencing record usage of our mobile banking app. Over 5,500 customers are logging on every minute."
RBS suffered hitches in December, when its websites were the victim of a cyber attack that left some customers unable to access their accounts.
That problem came just days after an embarrassing IT failure for the group on the busiest online shopping day of the year.
The group announced this week that it is to ban teaser rates and "sweeteners" in a bid to get back to basics and put customers at the heart of its business.
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