SU2 airfoil simulations don't converge for large number of surface points

[atharvaaalok]

I am running SU2 simulations with different number of coordinate points on the airfoil shape.
Each surface point I specify the boundary condition.

Simulations runs successfully for low number of surface coordinates (<600)
But as I increase the number of points (say 800) I see sudden divergence and SU2 failure.

What could be the main culprit here and how can I solve this problem?