So, I think I am having the same issue. When on cellular no drain, when on any other wifi no drain, but when I am home on my wifi I am getting mad drain. 20-25% in 8 hours overnight with phone doing nothing. I have restored with no backup same thing, restore without signing into my icloud no drain over wifi.
I will be doing more testing over the next few weeks.
gourki
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Las Vegas, NV, United States