Since it is a used phone, go to ''Settings > General Management > Reset > Reset Network Settings > Reset Settings > Reset''
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=== Update (05/27/24) ===
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Hi @forrestlambert
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See p.3 of the [document|38728|pcb layout] to view all the ICs under the shield.
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Find out which one is getting hot and then using its designation from the board layout, search for the designation in the [document|38729|service manual] to see what its used for.
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If the IC or another component is faulty, here's the [document|38730|parts list]. Search online for the part number for the component, to find suppliers.