Forerunner 965 stopped working with Bose QuietComfort Earbuds 2

Since summer 2023 I use my Forerunner 965 together with my Bose QuietComfort Earbuds 2. It always worked. It worked the last time two days ago, on the 27th Dezember 2025. Now, whatever I do, I can't get it working.

The watch shows the green ring saying that the Earbuds are connected. The Earbuds play the "device connected" sound. But then when I try to start the music, the Forerunner 965 says its looking for my Earbuds.

What I tried so far:

  • Rebooting the Forerunner (several times)
  • Disabling all other Bluetooth Devices in my flat
  • Deleting all headphones and then re-pairing the Earbuds (pairing works)
  • Setting the Earbuds to pairing mode (several times)

And all combinations of these. I now spent more than two hours. No luck.