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According to superstring theory, there are at least 10 dimensions in the universe (M-theory actually suggests that there are 11 dimensions to spacetime; bosonic string theories suggest 26 dimensions). Or the newly formed 10 dimensional universe; being unstable, bifurcated into a 4(stable, or temporarily stable) and a 6 dimensional universe. Our sister universe, also being unstable curled into(compactified) into its calabi-Yau manifold or orbifold.
What makes these universes unstable?

1. Is it due to a lack of symmetry?
But 10 dimensional universe possessed supersymmetry.In a 10-D universe, there are a million possible ways to break symmetry(for eg. Assume a square membrane stretched from all 4 sides. There are 4 possible ways(corners) to break symmetry, and hence destabilize it) Does this implies that a supersymmetric universe of higher dimension is actually unstable?

2. Is it due to false vacuum state?
Do higher dimensional universes lie in a false vacuum state; and hence make a transit into a true vacuum state? (by producing a bubble universe in a true vacuum or collapsing into calabi-yau manifold)

If this instability is directly proportional to number of dimensions possessed by the universe, then doesn't it implies that lower(1,2 and 3) dimensional universes must be most stable?
Where am I wrong?
Was it a natural selection that our 4-D universe was chosen to be stable(or temporarily stable)?

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