Forerunner 245 - No connection with App

Hi,

Since one week connection is not possible any more. I did not change anything from my side.

Other Garmin devices work properly (Edge 1030, Index 2).

I tried:

- restarting phone

- restarting Forerunner 245

- removed Forerunner 245 from App

- re-coupling with App (app recognizes the Forerunner, but configuration fails)

- connected via USB to PC  with Garmin Express to check for Update

- Garmin App removed and reinstalled on phone

- checked for permissions (gps, contacts, etc.)

Anx idea?

Thanks