Instability of Node in one point, Why not in others? How to solve?

[Anonymous]

See attached photo.

Found Instability of Node in one point in X direction.

But similar node are also in the model with similar member & releases.

Why this node is only instable, why not others?

If other nodes are also instable then what should I do to solve it?

Please help me. Thanks in Advance.

[teixeiranh]

Your instability is a type 3 instability. That happens when the program finds 2 elements in the stiffness matrix main diagonal with a enormous difference of values. If you have good results, then I think that you don't need to hurry about that.