Health app isn't working as it should - connection problems

Since last week, 10 september 2024 at 22.30h, the health app on my iPhone is not working anymore. It doesn't load new data and my trainingsessions are not saved in the app. I also can not update the user details on the app.

I tried to disconnect my Apple watch from my Iphone, as well I deleted the Health app from my iPhone.

Now everything is installed back again, I don't see any details from the past (last 6 years) anymore. And also I can not enter soms details, trainingsessions or see how many steps I've had today. The screen is totally empty inside the app.

When I want to look for devices which are connected, I only see a pictogram what says it's loading like forever.

Anyone who can help me out? Or do I just have to set back the iPhone to factory settings?

Thank you.