Exactly same problem here (Matlab R2017b, Windows 10). Computer crashes several times per day even with simple models but randomly same models work without any problem. Did anyone find a solution?
Sometimes model gets stuck to "Initializing" phase when trying to run it in External mode and sometimes it succeeds to start the external mode but gets stuck to "t=0.000". Even Task Manager freezes when this happens and hard reset is the only way to recover.