On a random basis, many of my apps are crashing - I tap their icon, the app opens, and then goes right back to the home screen. This is happening with built in apps (browser, texting, even the Google app store), as well as 3rd party apps from the app store. Most of the time, everything works fine, and then for no apparent reason, the problems begin. A few weeks ago, I did a factory reset followed by cleaning the cache partition. Things worked well for a day or two and then went back to the nonsense. The phone is not rooted and no other "unauthorized" mods have been done. Any tips?