Enabling physics on default cube static mesh actor causes it to bounce like crazy

Hey all,
I am trying to add physics to UE4’s default cube actor. However, when I enable it using the “Simulate Physics” checkbox- it starts bouncing around like crazy, and does not stop… anybody have any ideas as to why? My first thought was it was initially colliding with something and being pushed out, but I’ve tried spawning it in mid air and the problem still happens.

change the “mass in kg” (weight) check box to a higher weight maybe?..