If it stops due to an error, please send us the model such that we can reproduce and fix it.

If it stops due to damage (conditional break criteria, numerical exception in material model, or similar), please check if the damage and load level correspond to the expected/measured results. If not, check the boundary conditions (supports+loads), material parameters, geometry, and reinforcement.
If your analysis still stops before the expected/measured deformation is reached, please send us the model together with the measured Load-Displacement graph or an explanation why you expect a later failure.