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so I got an iPhone 6s that goes in a boot loop every day and I each time I put it in dfu mode and restore it ( ios 13.5) but it only takes 24h(approx) before it goes back into another boot loop . I was told it’s an ic problem but I’m not sure . please help

In my experience I’ve found faulty battery’s can cause random bootloops, have you checked the battery health in the settings menu? It could also be a sign the Tristar is starting to fail (U4500)