android roll a ball question (SOLVED)

I am testing a simple setup for a roll a ball game using tilt controls.

It all seems to work fine, rolls around great when I tilt but, I have made 2 ramps approx 45 degree angle.

When I try to roll the ball up or down these my ball bounces up into the air! I have no idea why this is happening can anyone give me any insights?

I am using rigid bodies on the ball and ramps.

I have no code as it is just the standard “roll a ball” prefab from unity. I want to be able to roll up and down this ramp (see attached picture)

the physics material of my ball is set to metal, same for the ramp.

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