My apps no longer open (Developer mode)

Hello everyone, 
today i discovered that many of my applications developed with Unity no longer open, some do not start at all, in others only the black screen appears. Now the apps have been installed on different devices and different accounts.
the problem doesn't seem to come from unity builds as somebody starts a certain app and somebody else doesn't. I can't find any correlation. Also unistalling the application manually and reinstalling it the problem persists, same thing doing the factory reset.
Please Help me!