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I recently started having this problem with my MacBook Air 2013 (i7/8GB) running the latest High Sierra:

Sleep itself works perfectly fine. If I wake up the device within the standbydelay of 3 hours, there is no issue. As soon as the device goes into deep sleep (also called standby/hibernation?), for example if it was sleeping overnight, I get the following issue:

I see the Apple logo appearing shortly with a chime, then I get a line across the screen and the screen goes dark as if I forced the device to turn off. After that, the device chimes again and it boots normally but it doesn't go back to where I started. It seems to perform a full reboot.

I already tried disabling some sleep related features like Power Nap. I cleared my NVRAM and SMC. Apple Hardware Test completes successfully.

Anything else I could try here? Oh, and I use APFS Encrypted with File Vault 2. Could this be the culprit?

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    It sounds like your your sleep image is corrupted. Try deleting /var/vm/sleepimage and see if the problem goes away. – Allan Aug 13 '18 at 20:23
  • Thanks, Allan. Weirdly, the problem still exists but I noticed the following: When I wake up the device shortly after it hibernates - say, 4 hours after closing the lid - it turns on and recovers the sleep image without a problem. Only on a longer sleep like overnight my problem still persists. – David Ramiro Aug 14 '18 at 9:30
  • Is it plugged in or on battery? – Allan Aug 14 '18 at 11:55
  • It's on battery, but almost fully charged. Last night I closed the lid at 95% and when it rebooted today it was at around 90% so it's not an issue of power loss. – David Ramiro Aug 14 '18 at 12:31
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    You could possibly have a failing battery. See this Q/A: apple.stackexchange.com/questions/272910/… Check the shutdown cause in the log (see question for command to review log) – Allan Aug 14 '18 at 12:38

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