Unable to verify App

While using the application, it suddenly quits. When we attempt to reopen it, an error pop-up appears stating, 'Unable to verify app. Internet connection is required to verify trust.' We tried accessing the VPN and regularity options in settings, and clicked on 'Trust,' but it was ineffective. The only solution that works is resetting the iPad. However, after one or two days, the same issue arises again. This problem seems to occur exclusively on certain iPads. What might be causing this recurring problem?"