I'm using WRF to simulate 8 days of data in winter, but the simulation stopped automatically without completion. After troubleshooting: 1) There are no error messages in the rsl.error and rsl.out files; 2) The same settings, except for the time, successfully simulated 5 days and 6 hours of data in summer; 3) The time step in the namelist.input file was set to either 27 or 18, and the simulation would stop automatically after producing data for one or two days. For example, when simulating data from 12:00 on January 10th to 18:00 on January 18th, it stopped at 16:00 on January 12th. When simulating data from 12:00 on January 11th to 18:00 on January 14th, it stopped at 15:00 on January 13th. 4) Running with either "./wrf.exe" or "mpirun -np 4 ./wrf.exe" would result in an automatic stop halfway through. 5) Changing the nesting from three layers to one layer allowed the simulation to run successfully.