physx collision won't stop

[jasond240]

First time using this amazing plugin and have what seems like a really simple problem with physx collisions... I'm simply dropping particles into a box but can't get them to stop moving.

I've searched the forum and added the suggested physx switch > kinematic but the particles still jitter a small amount way past when they should be stopped.

Here's my setup:

birth
position icon (surface)
speed
shape
physx shape (box)
physx collision (mesh) restitution 0.15, static friction 1, dynamic friction 1 (++ friction in case that was the problem)
physx switch (kinematic since sleep is disabled)

Any pointers here would be great!

Thanks
JD