I'm using Android 4.4.2 JK-760 phone and it recently started to download apps on its own, turn off and on when it wants and throws me out of any app that i try to open. I have no idea what is going on and need help!
Sounds like a virus to me. Have you installed any new apps recently? I would suggest trying to uninstall any recently installed apps, and if that doesn't work, you might have to wipe.
As the comment below nicely requested, this has happened to me on an old phone before. Apps that I never installed would appear on my homescreen, etc. It was because of an app that I had sideloaded onto my phone.