Character physics freeze when character goes off-screen

I set up character physics for an enemy in a PhysicsAsset to add extra movement to some parts of their armor. If I play the level in the UE editor viewport all looks good, however if I turn my camera away from the enemy for a few seconds then turn back the physics-enabled parts of the armor are now frozen in place.

Is there any way to stop this from happening? I’ve tried setting Sleep Family to Custom and the Custom Sleep Threshold Multiplier to 0.0 but this didn’t make a difference.

Thanks.