AirPods connection with Apple Watch dropped after few seconds.

I have a Watch Ultra 3 and AirPods Pro 2. In the past I have no problem at all to leave my home with both and listen music. In summary I was able to use Apple Watch without my iphone

Since, I don’t know honestly, I can’t use my AirPods with my Apple Watch if I don’t bring my iPhone

In fact is not only music that stops, neither Siri works

what it’s happening?

I try to play music in my watch connected with AirPods, and after a few seconds sounds stops. Watch shows that music is still playing but I don’t heard anything. Stop and play music doesn’t work. But changing Bluetooth devices yes. But after few seconds sound stops again.

there is no problem with another Bluetooth headphones.

I removed AirPods from all connected devices, and restarted all of them.

I went to outside with only AirPods and watch, I paired both. It started to work. I could listen Music for a few minutes. But after come back to my home and AirPods connect to my iPhone it started to fail again. I can’t listen music from my Apple Watch using AirPods when I’m using far from my iphone.