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Z390-E won't wake after idle.

MorphoV
Level 7
Hi,

I've read many reports of people having trouble waking up their computers from hibernate and sleep mode , but couldn't find any solution , and my case is a bit odd:
When I leave my computer (Z390-E, i9 9900K) with nothing to do, the power led will turn off after a few minutes. Pressing the power button turns the led on again, but my screens remain black.
It's happening on Windows 10 and Catalina 10.15.5 (opencore 0.5.9), even after deactivating hibernate mode on both OSes.

The motherboard's firwmare is up to date and I tested my RAM with MemTest86... no error.

Can it be a bios option I missed?

An advice would be welcome.
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