I stumbled across this issue even in 2021. I recently purchased a AX860i from a dealer in germany. Wich seem to be a refurbished one with some corsair netherland check ok stickers on it. The issue arrise quickly like after 30minutes of use it reboots. As it gets hotter it enter a infinite reboot loop.
Just looked through the internet and found out that the issue seem to be "normal" for the AX860i. Wich is sad as i thought after RM , RMI, HXI i now get the top of the line. Funny that this is the first Corsair PSU wich failed on me.
I read that it could be too much stress on the connector PCB and a failed mlcc capacitor. Also i read it could be a missing 470k ohm resistor on the PCB wich was added on later revisions.
Now the decision should i just return it and look for another PSU type , should i try to fix the MLCC, 470k Issue myself or is it possible to RMA this PSU ?