OnCollisionStay() doesn't get called.

Hi, I am facing a weird problem.
I have a character that has a sphere collider and my land has a mesh collider.
The problem I am having now is somehow OnCollisionStay doesn't get called even though my character doesn't move at all after OnCollisionEnter got called.
Weird thing is if I give focus on my scene window then it starts calling OnCollisionStay correctly.
What am I doing wrong or misunderstanding?
p.s) I am using rigidbody to control

 

Make sure the collider is still there. Pause the game and locate it. I had a similar issue where the collider flew off once it hit the terrain.

 

I turned off all the bouncing related code and still have a same issue

 

Could you show the code?

 

I am sorry it's actually few hundreds lines of code.
I kinda fix it calling rigidbody.WakeUp() every late update.
But I am not sure what problems could be caused from it.

 

Did you check the sleep velocity value:
http://docs.unity3d.com/Manual/class-PhysicsManager.html

 

Thank you