Close the app completely. Then reopen the app and check out. If that doesn’t work either, turn on flight mode for at least five minutes. You will then be checked out automatically from the location you were in when you turned on flight mode.
Alternatively, for Android smartphones, we recommend deleting the cache or data of the SBB app. To do so, go to the Smartphone settings under ‘Apps’, ‘SBB Mobile’, ‘Storage’ and then ‘Clear cache’.