Hi, I also live in China. I found it's normal after restart phone today. Based on your feedback and my debug, I think this is apple's problem. The sandbox environment must was wrong or unstable. For rejecting the ipa I submitted, I fell very incredible. But I still submit a new ipa to review again.

Did you fix it? I also have the same problem as you . I try many methods to fix it, but now, I not have any other way to fix it. But last week, my app was normal.