Does this problem happen if you put the system to sleep from the Apple menu, wait a couple of minutes, and press a key to wake the system?
Or does it only seem to happen when the system puts itself to sleep?
The most common causes for sleep/wake problems on this system have been:
- An internal USB connection to F_USB header on motherboard. This might be a Corsair power supply, Corsair liquid cooler, NZXT liquid cooler, etc.
- Wake for Network Access in System Preferences --> Energy Saver. This should be disabled.
- Power Nap in the same Energy Saver pane. This seems to work for some, but for now keep it disabled.
- Some external USB or Thunderbolt devices might also interfere with sleep/wake.
We apply the process of elimination to try and identify the offending device or devices, as follows:
- Disconnect USB and Thunderbolt devices (except keyboard/mouse).
- Test sleep/wake. But if the problem only occurs when system sleeps by itself, then this can take quite a bit of time. But it might be worth attempting anyway by disconnecting all USB and Thunderbolt external devices except keyboard and mouse.
Other factors:
- In BIOS, disable all "Wake on LAN" settings.