User Profile

In the last week, two customer apps have stopped working, and the behavior resembles certificates/profiles expiring: app quits on launch and there is no longer any provision profile to accept. However, when I check these items I find:- 2 producton certificates, one expiring May 2019 and the other May 2021.- 9 provision profiles all dated between February and July of 2019.We rebuilt one of the apps with the production certificate and the customer's provision profile and it worked as expected. I'm trying to determine if we need to proactively push out rebuilt apps to customers who only received new apps in the last few months.Why would these apps behave like they have expired certs? can I check an app to confirm it has the proper certs?Thanks in advance.D.