I just did my second feedback on this issue. The first was an iPhone 15 yellow that I purchased about two weeks ago that had severe battery drain issues and I had to return it because that was the only solution that Tech Support could offer on my ticket. I purchased an iPhone 15 Pro yesterday, in hopes that it would perform better, I made sure to ask the associates at the store to make sure my phone has been manufactured recently. They told me my 15 pro had been manufactured December 29, 2023. So I thought perhaps I’d get a phone without the issue, but this phone has the same battery Draine issue as my iPhone 15. I have turned off everything and turned off background refresh, and turned off screen always on, etc. etc. all the things we’ve discussed in this group and nothing has helped. I just now tried to “reset all settings” as someone else on this forum suggested that might help, and I will let you know if that helps. I put in my second feedback about this iPhone 15 Pro. I have right now. This is crazy.