Switch shut down unexpectedly. Power cycle fixed it. Logs showed CPU hit 66°C which is the real shutdown threshold. Platform output shows 104°C as critical. That 38 degree gap caused all the confusion. Lab stress test at 99% CPU only reached 50°C so sustained load was not the cause. Most likely a short CPU burst. Deployed monitoring package to fix threshold display and capture telemetry going forward. Display bug reported to RD team for permanent fix.