Some of my apps close right after I open them. For example, if I open eBay or Facebook apps, I see the main page for about a second or two, then it goes back to the home screen. Why is it doing this?
I have had that happen to a few. Usually if it starts happening to one, it seems to "spread" to others. I have turned my phone off and on, and it seems to fix the problem.
Deleting and re-downloading the apps directly on the iPhone restores functionality to that specific app.