I have not seen this specific issue, but in my experience most unexpected reboots while a device is simply running are the result of software bugs and not hardware errors.
If you want a definitive answer you should open a JTAC case and upload the RSI, logs and any core dumps on the device for analysis.
I did search the public bug database and didn't find anything with this error message, but you could also do some searching there with key words that apply to your configuration.