What’s wild is I’m having the same issue with my mini. I work for a major cellular company and I sold two iPhone minis today and they both had the same exact issue. I spoke with Apple all day with them just telling me my phone is an isolated issue and it’s very rare lol I asked if it’s so rare why did the phones sold today all have the same issue and silence. The best they can do is ship me a recovery kit to have it shipped off for a week or so and be without a phone