You know dat feel:
Playing a game, suddenly a friend texts, you minimaze the game to see what's happening, reply to friend and return to the game. And you realize your game re-opens again..All your progress...record...all again...
Memory Locker works simple, easy. You choose which apps you want to lock to prevent them from killing (you can also choose system apps, of course), and the app does everything for you. And yes, root is needed.
App costs only 1.5$ and if you don't like it, you can refund it and get your money back. Money back guaranteed, as the author says.
PS: Don't try to "memory lock" too many apps at once.