This does not tell us strictly speaking if the canbus itself has issues, but we have a heartbeat device on the canbus. If we fail to hear from it (or any other traffic) for a set period of time, we reset the canbus as you described. In practice I've only seen this reset trigger when I've forgotten to specify or turn on a heartbeat device, or intentionally for testing. It was implemented as a safety net since the older generation windows based system (which was admittedly much larger, more complex, and used third party hardware and drivers) would sometimes fail for mysterious reasons.
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