Siri has been extremely hit or miss on B1 and B2. When using "Hey Siri" nothing happens most of the time. I though my V2 AirPods were broken and the Hey Siri command wasn't working on them until I discovered that the phone was having the same issue. All my Siri settings are correct. I tried turning Siri on and off and resetting network settings. After tying different troubleshooting steps, it might start working again for a few hours and then the same thing happens. This behavior does not happen in ios12. I did a test and downgraded and its perfect in ios12. Just curious to see if there's anyone else experiencing this.