Rebooting the phone with the Oppo powered on and plugged into the has not completely solved the problem. However, once there a few drop outs, if I keep listening, they go away. Sometimes the drops seem associated with my looking at apps or chrome. The problem of fuzzing out and slowing down that I had before 10.3.1 is gone. So one irritation has been replaced with another. In my experience so far, once I experience a few drops, afterwards everything runs smoothly.