Max31865 Overvoltage or undervoltage fault

Max31865 Overvoltage or undervoltage fault
Once the underlying issue is corrected, use the
"FIRMWARE_RESTART" command to reset the firmware, reload the
config, and restart the host software.
Printer is shutdown

When i was printting,It suddenly appeared!!!!!
I don't konw why????????????
the wire connected solid! And no indication towards Leakage!It just suddenly happen!!!!!!!!

Start by reviewing the Max31865 overvoltage or undervoltage fault context and the documented FIRMWARE_RESTART behavior, then reproduce the failure during printing if possible. No source files or tests are named; the issue is complete only when the underlying cause is identified and the corrective change is verified without the printer shutting down unexpectedly.

Written by the indexing model from the issue text.