Physics simulation of Solar System freezes

Hi all,

I am attempting to make a simulation of our Solar System where the gravities of each celestial bodies affect each other. My blueprints for the simulation is from this video: Tutorial Video | Blueprints of Gravity Simulation.

It seems like at certain values (too high or too low) of the celestial body’s mass and initial velocity the simulation freezes upon starting. As you can see in this video that I have recorded: Video of Problem, when I delete the larger star, the smaller one moves normally but freezes in the presence it.

Why is this happening? I am at my wit’s end.