Customers of three major banks claim to have been affected by mobile banking outages last Friday (28 February) morning, with one institution blaming the problems on unexpectedly high demand on IT systems on pay day.
Royal Bank of Scotland, Santander and Barclays customers have all taken to Twitter to complain that they are unable to access services through their smartphone or tablet devices.
RBS claimed that the problems were related to higher than usual demand on pay day.
"We are currently experiencing record usage of our mobile banking app. Over 5,500 customers are logging on every minute," a spokesperson said.
"Unfortunately some customers are not able to successfully log in due to the high traffic. We are working to urgently address this problem and apologise to those affected."
The spokesperson was unable to provide any further details at this time, but said that the bank is currently attempting to resolve the issues.
One RBS customer - @deedee62 - tweeted: "RBS get your mobile banking sorted!!!!! You have enough money to get decent technology!!!!".
Another, Kyle Ryan (@kylejamesryan), said: "RBS Help I can't log into either mobile or internet banking! Keeps saying locked for 10 mins due to security reasons!"
Customers of Santander also took to the social networking site to highlight the mobile banking problems.
@DruStu tweeted: "Is anyone else unable to load the transactions page on the Santander mobile app? Mine is huffing". Vanessa @van_essa66 added she was "having problems with Santander's app too".
However, Santander was unable to confirm that it is experiencing any problems with its mobile services.
Meanwhile Barclays issued an apology to customers unable to access its mobile banking app this morning, with problems yet to be resolved.
Users of Barclays mobile banking application were unable to access account information from 7.30am, due to an unspecified IT issue.
A bank spokesperson said that it is working to resolve the issues, which are continuing to affect customers.
Barclays also issued an apology from its official Twitter feed: "We're aware that there are issues with accessing our Barclays Mobile Banking app; this is being looked into on an urgent basis.
"We apologise for any inconvenience caused and we'll update you as soon as we can when we have further information."