Hi 
We haven’t quite declared this a full incident as it has only affected some users on a very recent version of the Android app, did not affect payments, and as far as we could tell, did not affect core app functionality.
This banner was displayed as a result of one minor request related to the app checking the state of your Overdraft failing on a single field. We believe we’ve already fixed the issue server-side and it was quickly rolling out before we in Customer Operations (Support) even managed to write a status page message. 