This is a sample generator shader, using 2D simplex noise (as implemented here, with a few parameters exposed to fancy it up.
Snapshot Fixes Drop-in fixes for 2 corona snapshot issues.
If you want to animate different objects throughout the game with proper time interval of time, you can use this code. I've used this in my game to animate balloons and other objects in game.
If you have a game released & live, sometimes it's difficult determining the cause of bugs that your end users have.