There were/are a couple of different issues that result in the same logout, the one mentioned in the OP was only an issue on a specific TestFlight build and was quickly fixed before it went public.
If you’re still seeing logouts on the latest versions of the app, see @james’ latest post in this thread and do post if you find any consistent cause.
Hi. I downloaded the latest version of the app and it has logged me out and now doesn’t recognise my email when I try to log back in (and yes I have checked the email address is right!!). Any help?
Hey! The latest version of the app has a fix! We expected to release this week, but we had a few issues so should be available on the app store sometime next week now