Weird jitter on Android using Character Controller

Hello

I am making a 2d game with a ball rolling across a field for android. I was previously using a rigidbody to control it, but was facing some physics problems, along with some unwanted behaviour. I was introduced to Character Controllers, and everything seemed to work well until i ported the game to android. The camera follows the ball at all times along the x-axis using the standard assets camera following script. I get this weird jitter, not constantly but almost all the time, where the character flickers and jumps on the vertical axis.

I am using a constant movement downwards to simulate gravity, and a simple movement foward to move. I am also rotating the object when it moves.

Any ideas how to fix this jitter?