Health app has crashed, data gone.
IIphone 6, after Endomondo updated yesterday, Health app was no longer updating. On restarting the app, the dashboard and all the data disappeared. Restarted the phone, removed linked apps, all to no avail. Cardio app is reporting an error - unable to write data to Health. Cannot enter any data manually. Every time I restart Health, the Dashboard resets. Tried 'steps' etc, still reporting no data. The linked apps are - Cardiio, Endomondo, Human and MyFitnessPal. Any ideas?
iPhone 6, iOS 8.1