Always be suspicious of any recent changes prior to the crash. Also, placing a breakpoint on the PX5 RTOS central error handling function px5_internal_central_error_process can show if the PX5 RTOS detects any errors. For especially strange crashes, verify that all thread stacks (and system/ISR stacks) are large enough. If the crash is happening during the installation process, visit the examples provided in the PX5 RTOS distribution to see if they run properly. Please see the Troubleshooting section in the PX5 RTOS User Guide for more thorough information.