Minecraft PS4 constant errors
Solution 1:
CE-34878-0 is the general error on Playstation 4 apps. It means the application did something it wasn't supposed to so the Playstation OS had to stop the program.
Playing on PS4 I've encountered quite a few of these errors as well. PS4 is the most recent bedrock port so it doesn't surprise me that the game is crashy. Hopefully in a few updates the game will act more stably.