Hi everyone,
A CommCare point release was just made available on the Play Store to fix a regression released in CommCare 2.41. This bug made it so that in the scenario where a form is resumed automatically after a user has been auto-logged out (by the user session-expiration that occurs after 24 hours), the submitted form could potentially contain data that violated constraints defined in the form.
Fortunately, the situation that can lead to this issue is rare, and the bug itself was only active on CommCare versions 2.41 and 2.42 (between December 2017 and now), so we do not expect this to have affected many users. Having users update to the latest version of CommCare from the Play Store will prevent this from happening going forward.