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Crosshair VII Hero - Fans stop and system overheats - is my fan controller chip dying?

Level 7

I have had my Crosshair VII Hero for a couple of years now and noticed very recently that all my case fans and CPU fan stop running after a random amount of time. This can either be 30 minutes but usually after a few hours. I have tried resetting BIOS settings, updating to thee latest BIOS and uninstalling applications such as ICUE, MSI afterburner that might somehow be causing this. 

One thing I have noticed is that if I look in HWInfo, the fans are not listed when this happens. Sometimes only the CPU fan is listed but is running slowly e.g. 600RPM.

I have also tried installing AI Suite 3 which can see all the fans when they are working but isn't able to control them when the problem occurs. If the CPU fan is still running when this happens, setting Full speed causes it to stop!?!.

I am starting to think that this is a hardware issue and the chip that controls the fans is dying. Has anyone else encountered this issue before and managed to resolve it or does anyone have any suggestions for me to try before I dig out my old school drive bay fan controller.