>>2939677
I've had the same issue
>>2937311
After disassembling the head for my machine i've realized that my heatsink fan was brim-filled with dust over the few years i've had it and caused heat creep, killing several 8+ hour long prints at the halfway point randomly due to getting stuck in the heatbreak.
Give the fan a quick vacuum. It might be spinning, but the dust may just block the actual air flow from keeping the radiator cool.