The game crashing at the end of a patrol was something that happened early in the games life. What version of SH4 are you currently using. If your using the origional version of the game (v1.0), you need to patch it up to v1.4. It would be even better if you upgraded to v1.5 which is the UBM. V1.5 is the final version and I believe the game crashing at the end of the patrol has been eliminated, but not 100% sure of that.
Also upgrading to v1.5 makes almost all the mods available with SH4 compatible then.
