Chase UK, which boasted last week that it had signed up a million users in its first year, first confirmed that it was investigating a problem with its systems yesterday at 12.21pm BST.The bank warned that customers might "have issues logging in, completing online card payment security checks and navigating the app".This morning, at 08:19am BST, it tweeted the same details, insisting that its teams were investigating "around the clock".It wasn’t until 07.50pm BST that Chase said that it was "almost back to normal", although even then customers could not edit their details, change scheduled payments, add a payee or change a payee’s details, with many functions suffering from "degraded performance".No details on the cause of the problem have been provided by Chase, which worked with 10x Banking, the cloud-native fintech set up by former Barclays chief Antony Jenkins to build its platform.Inevitably, customers vented on Twitter, despite Chase limiting who could reply to its tweets:

Currently on holiday and my @chase_uk app is not working lol, very unprofessional that the tweet is on no reply. Your language sounds like you have been hacked and got no idea what went wrong. Guess if you want an online bank go for @monzo or @StarlingBank https://t.co/d8pVd6xidL— iamdinotwothree.sol (@iamdinotwothree) October 5, 2022

Been trying to view my account on the app since late Monday, its useless. Seriously thinking about closing account and moving elsewhere when I can see my money again :-( https://t.co/SKvaKriLUI— Steve (@vegan_steve) October 5, 2022