Hello, Welcome to Microsoft Q&A,
From my understanding, you are using the 3D viewer to view 3D models, but one of your devices gets crashed when loading the models.
Since the models only have issues opening on only one unit, it seems like something went wrong with the firmware, please make sure the OS Build has upgraded to the latest version and try to Clean-reflash your device. If the issue still throws, please open a support ticket through this link: http://aka.ms/hololenssupport so that we can provide you with a deeper diagnosis.
By the way, the hololens-development tag is for questions about programming HoloLens apps. HoloLens device support is not currently available on Q&A.
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