Breaching of the principle of sufficient reason

Newton's first law actually doesn't guarentee that a movement that deviates from uniform comes from a force applied. See Acausality in Classical Physics.

And since the mass spontaneously starts to move in an arbitrary direction, and since the system exhibits rotational symmetry, the motion itself breaches the principle of sufficient reason in a twofold manner

1. it starts to move spontaneously, at an arbitrary instant .
2. it moves in a direction that is arbitrary.