That happened to me, too. Out of nowhere, I exit a working app, next one doesn't work. They all don't work. I soft reset, then hard reset, nothing. And I notice my media is gone.
This is because the iPhone, for whatever reason, resets your DRM permission. Apps are covered as are movies, TV, music, etc. And if your media isn't DRM-protected, the iPhone, I guess, just assumes it is and shuts it all down. Not sure yet how to fix it but it DEFINITELY SUCKS. The whole point of the iPhone is it's a computer for when you're away from my computer. But if I can't go 1 F***ING 24 HOUR CYCLE WITHOUT HAVING TO RESTORE IT, WHAT F***ING GOOD IS IT?!?!
And this is the 2nd incarnation of the device. It's supposed to get less buggy, not MORE SO! I hope people get fired for this and I hate people getting fired cuz it just sucks and people gotta provide for their families, but when you f*** up like this, you deserve it.
I hope people from Apple read my post because as a longtime Windows user and almost-Mac-convert until this iPhone debacle, there is one crystal-clear truth arising from this litany of f***-ups:
APPLE IS BECOMING MICROSOFT!!! Apple the company was so smugly superior for years. And it was largely justified. It can recover. But it needs a floor-to-ceiling overhaul of its corporate culture it appears.
I was gonna buy an iMac and make the switch but I see no reason to do so now. If my tech is gonna suck and be buggy all the time, I'll stay with the crappy hardware I know. Apple has lost a customer.
But enough of my rant. Hope this helps people.