Klipper reports SHUTDOWN : verify_heater. ##Urgent##

This error is driving me nuts. I have 4-5 models , printed to 10-20%

I have a 6-7 day print that I need urgent.
After 12-36 Hours this error appears.
*
"Klipper reports: SHUTDOWN 

Heater extruder not heating at expected rate
See the 'verify_heater' section in docs/Config_Reference.md* "

Spec:
V-core 3
Octopus pro board
Phaetus Rapido HCT
Klipper updated
Sliced on OrcaPrint


I can see from the log that:
The first hours the extruder target and temp are all good. Then after a number of hours, the extruder is not reacting to the applied PWM signal. First by a few degrees, then finally 20-30 degrees, and failure.
(Log attached)

I have three likely culprits:
  • Driver on Octopus pro
  • Cable to heater
  • Heater
Does anyone have experience ???
Ideas ??

Thank you ! This model is going on show early May
Tor
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