FR945 (4.40 firmware) issue with the brand-new Adidas FWD-01 bluetooth sport headphones (with the most up-to-date firmware installed - 4.2.3.9): the headphones just disconnect (as if there was a kind of power saving mode which automatically triggers the headphones to power off) from the FR945 smartwatches after 1 hour (precisely) of operating (no matter if you have had any interactions related to the music playback during this 1 hour of operating or not). To connect the headphones back, one has to power on the headphones again and re-connect them with the FR945 smartwatches by resuming a recently paused music track.
The issue is NOT observed while the same headphones are connected to, for instance, an Android smartphone (the headphones just continue operating after 1 hour of operating without any connection issues).