For some reason in the last few nights I’ve not had any heart rate tracking from my Mi Band. It’s worked absolutely perfectly for the last year or more so this is all a bit unexpected.
The motion tracking is working as expected.
I wonder if this is related to a recent update to Android that has installed on my Galaxy S9.
I’ve looked at the settings in Mi Band Tools and everything seems as expected. I’ve also checked there and it’s clearly been taking readings throughout the night, they just don’t seem to be making it over to Sleep as Android.