New phone. New OS. New app version. Same issue. Getting really fed up of having to fix it. Especially now Monzo want a video when I set the app back up. 
Just to add. At this stage, with the amount of times I’ve had it happen, I believe I’ve identified the cause. It happens whenever the app is running in the background and you restart you phone for whatever reason. (It dies, you update it, or you turn it off, or you restart it as part of troubleshooting something else). I can reproduce the issue 100% of the time by force rebooting my phone whilst the app is running in the background (not swiped away).
It’s linked in some way to the other bug I’ve reported where the app opens but won’t load after your phone dies whilst the app is running in the background. Part of the troubleshooting to fix that issue involves rebooting your phone which in turn causes this one, and it means having to reinstall and reset the app twice if the other bug occurs first.