Hi Ram, 

Have been doing some debugging and found that in my first simulation I have a spike of kinetic energy in the energy summary from the solution files: 

Could this be the reason I am getting errors in my second simulation?

To investigate some more I assigned a kinetic energy tracker for all the bodies and found that the spike is not from the bodies and also the kinetic energy is an order of 2 magnitudes out: 


I checked hourglass energy and is 0. I turned damping off and it made no difference. Also the simulation looks like it behaves as it’s supposed to. Please could you advise me on anything I can check.