(Redmi Watch 4) No synchronization heart rate etc. from sleep analysis

Hello everyone,

Since a few days the Mi Fitness app no longer synchronizes the heart rate, blood oxygen and stress level of my Redmi Watch 4 from the sleep analysis.

The sleep duration and phases are synchronized, but not the rest. The data is displayed on the watch but not transferred to the app. I have already re-paired the watch, deleted everything, etc., but the error persists. Has anyone else had this and perhaps found a solution? :)

Thank you very much!