Last Monday I created an app and installed it on both an iPhone 6 plus and and iPad Pro. The app worked perfectly on both devices. On Thursday I tested them both again and they worked. On Saturday I found that the app would no longer work on either device. It would start to launch then disappear from the screen. There are no messages. I noticed that the Setting -> General ->Device Management menu was no longer on either device, so I could not delete the app from that menu. On the iPhone I was able to delete the app normally and reinstall it, and it again works perfectly. The Setting -> General ->Device Management menu is back.
Is there some time limit on how long an app I create will work? If this is normal behavior, I don't like it.