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There isn't anything specifically wrong with the A17 Pro. The N3B process it was built on was viewed as expensive to make compared to the N3E process that followed (which is what the A18/Pro and M4 chips are made on) so it was thought that Apple would transition to chips made on N3E as quickly as possible since they were generally cheaper to make but it doesn't mean that N3B chips like the A17 Pro and M3 have a lot of problems.
 
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