Cause of shutdown when sleeping

Question

MacBook Air 11インチ Early 2015

2015年3月のアップデートではAppleの11インチMacBook Airは第5世代Intel Core i5またはi7プロセッサーを特徴としており、これによりわずかな性能とバッテリーライフの向上がされました。

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livfe @livfe

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投稿日: 2026年2月1日

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Cause of shutdown when sleeping

What would cause this unit to shutdown after around 20 minutes when put to sleep? We haven't changed any battery or sleep mode settings and the battery is a good one. We can close the lid and open it after a few minutes and all is well, but when it is left closed for say 20 minutes the unit is turned off. We tested it with our clean installed SSD and the same happens..... We have reset the SMC, PRAM, run diagnostics & there are no errors being reported, ..... I have been told this was an issue with Monterey & up, but I never encountered this before....I noticed that when it is connected to a charger it didn't shut down after the lid is closed for a longer time. System is on 12.7.6.....baffled.

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Is there any indication if it shuts down, or just powers off?

What if the lid remains open, and you put it in sleep mode manually?

Allan Binderup さんによる2026年2月8日

@allanbinderup Only when the lid was closed for around 20. minutes, I tried sleeping it manually and it operated normally.....

livfe さんによる2026年2月8日

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Is there any indication if it shuts down, or just powers off?

What if the lid remains open, and you put it in sleep mode manually? — Allan Binderup
@allanbinderup Only when the lid was closed for around 20. minutes, I tried sleeping it manually and it operated normally..... — livfe