iPhone 15 Pro Max battery depleting in a few hours

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Hi

 

My wife’s iPhone 15 Pro Max battery depletes completely in a few hours. She went to work this morning at 9am with 100% and at 13:00 it was down to 6%. She didn’t use the phone at all during that time.

 

Any ideas?

 

It only started happening a few days ago.

 

EDIT:

I just checked her battery activity and Instagram was 89% of the battery usage while her phone was in her pocket in work. What is Insta doing while the phone is idle and how does she fix it? Bearing in mind that she hasn’t...

 

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