I have the Ticwatch E and the Ticband and I've been using 24-hr heart rate monitoring with both for a while now. I use both the Mobvoi app and the Google Fit app to check my data. This morning, I opened the Mobvoi app on my phone and was surprised to see that there was no heart rate data (and therefore no sleep data) available. Even more surprising was that I scrolled back and now all the heart rate data is gone! For any day in the past. I then went to the Google Fit app on my phone and, sure enough, the heart rate data was all there. So I know that the heart rate on the watch is working, however, the Google Fit app cannot get heart rate data from the Ticband directly, it gets it via the Mobvoi app. So now I have a gap with no data when I have the band on instead of the watch. I would be OK with just using Google Fit if it wasn't for the issue with data from the band.
Does anyone have any idea what might have happened and how I can fix it?