Internal design 'compromises' may be to blame.
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apple iphone 15 overheating: Apple says Instagram, Uber like apps responsible for iPhone 15 overheating, here's how the company is fixing it - The Economic Times
iPhone 15: Apple says it will fix software issue causing device to get too hot - and blame some apps for 'overloading the system', Science & Tech News
Apple says it's working on fixing iPhone 15 overheating issues
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Apple Tackles iPhone 15 Pro Overheating Issue: Software Fix Coming Soon • DealsNowToday