Upgrading to PacketWise v8.5.6 or higher will help prevent this NMI crash. For further information, please see the PacketWise v8.5.6 release notes found at https://bto.bluecoat.com/download/product/32 . NOTE: BTO credentials are required. If you are unsure if you have BTO credentials, search the KB for "bto credentials."
From PacketWise v8.5.6 Release Notes:
PacketWise 8.5.6 improves hardware watchdog restart issues that occasionally occur on PacketShaper 10000 and PacketShaper 1400 models; an error notification mechanism has been incorporated to provide an alert when the issue is encountered. [SR 2-317363152, 2-356609992, 2-358610842; B#146446]