Hello Ralu_rock,
Thank you for using Apple Support Communities. Based on your post, you've had some struggles using your AirPods with your Apple Watch, as the audio stops a few seconds after starting to play. We'll do our best to assist with this.
You've done some nice isolation here, good work. If the AirPods work fine with your iPhone, then we'd recommend the following:
- Check for software updates for the iPhone and Apple Watch. The AirPods are updated along with the iOS updates, so it's important everything is up to date. See the following for help updating both devices: Update your iPhone, iPad, or iPod touch and Update your Apple Watch
- Reset your AirPods, when connected to your Apple Watch: Reset your AirPods
- Test multiple audio apps on your Apple Watch and connected AirPods. (This will help us isolate the issue further.)
- Make sure it's in range of your paired iPhone, unless the music is stored on the Apple Watch itself.
Should it continue, please reply back with the following:
- What happens when you pair the Bose headphones with your Apple Watch?
- Does the same issue occur while on calls using the Apple Watch and AirPods?
Wishing you the best, take care!