Simulation stops at simulation but doesn't diverge mpirun error
 

Hi everyone,
I have a strange problem with my simulation on OpenFoam.
I notice that the simulation during the running stops at certain iteration, but doesn't diverge, simply no proceed.
In other similar simulations the running stops at certain iteration, without diverging and after some time exits, giving me the following error:

mpirun noticed that process rank 0 with PID 27164 on node thinkstation-node exited on signal 15 (Terminated).

Moreover I ran other similar simulations with same geometry, same mesh, changing only boudary conditions and they run without similar problems.

The solver that I use is rhoSimpleFoam
The mesh consists of 10^6 cells.