MacBook Air is shutting down randomly
Why is my new MacBook Air shutting down randomly, and how can it be fixed?
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Well the first step is to see if there is anything in the machine that is being overtaxed for any reason.
https://discussions.apple.com/docs/DOC-250002463
Etrecheck can isolate software reasons. Users here can usually help you isolate any software issue.
https://support.apple.com/en-us/HT202731
Apple hardware diagnostics can isolate hardware issues.
If the machine is under a year old and has not had AppleCare purchase, hardware issues usually can be addressed with AppleCare. If it has AppleCare purchased, then you can address them for a longer period of time.
