What is the best thing to do if your iphone always make unwanted shutdowns?
Should I change my battery if the iphone is keep on doing unwanted shutdowns?
iPhone 12 Pro Max
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Go to Settings>Battery>Battery Health. What is the Maximum Capacity percentage? If it's 80% or less, you need a new battery. Are there any other warnings on that page?
You can also contact Apple and have them run diagnostics.
Genius Bar Reservation and Apple Support Options - Apple