SteamVR Controllers Constantly Vibrating

So I created a new project using Unity 2019.3.7 and SteamVR plugin v2.5 and for whatever reason the controllers are constantly emitting a light rumble. It's very bizarre and happens in a completely empty scene... does anyone know why that would be? And is there any way to turn it off?

 

Going into the HandCollider prefab and using a special layer (instead of everything) for hand collision solved it for me.

 

If memory serves me right, I think the initial Teleport tooltip which is here by default provokes this light regular rumble as long as the player doesn't use the teleport.

Other than that as pinkscooter said, it could be the hand physics system colliding with your head or your body collider