The issue has been resolved and was a result of a change to how we display some information in cards.
Customers using the iOS app on 5 December 2019 between 13:15 - 15:15 UTC may have experienced a freeze when refreshing certain pages. We're monitoring the situation closely for any additional errors.
If you are affected by this issue please force close and re-open the app or, as a last resort, uninstall and re-install the Luno app. Should you still face an issue using the Luno app on your iOS device please reach out to our team via https://www.luno.com/help/tickets/new
Sincere apologies for any inconvenience caused.