One question is how i can find all elements which has this probleme because my model is big with numerous elements. When i use this mode these elements will be deleted automaticlly, so i do not know exactly positions of these elements to restore.
You may try to export bar tables from to Excel and compare bar number columns.
Select all bars in the original model. Delete them. Delete all nodes that are not 'attached' to any bar. The remaining nodes will indicate the positions of bars you need to restore in the repaired file.
And what are causes of this problem to avoid in building of model
I'm not able to determine the origin of this situation yet I strongly recommend that you upgrade to the latest version of Robot.

Artur Kosakowski