I received my Series 4 about 3 weeks ago. At the time, when using the heart rate complication for certain watch faces, it would display the last heart rate reading. I've now noticed, I believe since 5.1, that it no longer displays the last reading consistently, but instead it will show -- next to the heart icon. Is anyone else experiencing this? I have found that restarting the watch will sometimes fix it, but not always. Thanks in advance.