Entire issue is explained here https://www.reddit.com/r/android/comments/7zpmy6/_/

OnePlus always says 'Never Settle' and yet they're here ignoring customers about a serious bug in the OnePlus 3T refusing to fix it. This is unacceptable since this is one of your best selling phones, you might be a bigger company than when you started off but that's no excuse to ignore customers.