Health app data transfer stopped on iPhone

Hi everyone,

For some time now (after installing a new iPhone 16), the Health app's data transfer seems to be malfunctioning. Retrieving and downloading my data has suddenly stopped. It seemed to be working fine on my iPad, but hasn't been since the day before yesterday.

Actions taken:

- Toggled the Health data toggle in iCloud off and on (I waited a few hours for this). It then retrieved the data again, but then stopped again.

- Battery not in power saver mode.

- Latest iOS update. All devices have iOS 26.2. However, the problem started during iOS 26.1.

P.S.: Also the condition-app is not syncing anymore.

Who has the ultimate solution?

Thank you!