Mine eventually got loose and would so in and out of charging constantly. And why is it that it seems every wireless case has such a small wireless charging target? Once I find it, I am good, but it is a pain to get it started sometimes. If I take off the case and wireless charge the phone, I can just set it in the general area and it will always start charging.
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I have a feeling 12 was the culprit too; although, I will have to see. I was getting the USB message until I turned on USB for lock screen, but then it would always go in and out of charge. Not sure if that was 12 or the loosening though. Got a different case until yesterday when I thought I'd give it a try again. No going in and out of charge. But I don't know if maybe it relaxed back to close its original stretch or if 12 was the culprit since I am on 13PB3 now.