Stops working for no reason

This is the second time this has happened. The app runs fine for a few weeks, then it decides to stop opening. This also happens with other apps like Calendar and Photo Viewer. App goes from "Trusted Windows Store App" to just "Windows App", and it no longer works. Users have been reporting this problem since July and Microsoft still has done nothing to address this issue. There is no way to uninstall and reinstall so the only option to delete the user profile and create another one. Way to go Microsoft, you can't even get a simple calculator App to run properly.