Lost bluetooth between lenovo yoga and harman kardon onyx studio 3

[stephane_75011]

Hi all,
I used to stream music from my lenovo yoga to this wireless speaker.
After many months of good working, this connection doesn't work anymore.

In windows 10, through the bluetooth device window, the speaker "HK Onyx Studio 3" appears connected, but it doesn't appear in the output list of periphiral devices, so it isn't possible to select it as we did before, and output the sound.

I contacted the hotline of Harman Kardon that suggested me to ask the Lenovo's hotline to provide a driver with protocols A2DP 1.3, AVRCP 1.5, AHFP 1.6, and Bluetooth 4.1.

What do you think about it?

Here is my configuration:

- Lenovo Yoga 500 with Windows 10, and Bluetooth 4.0
- Harman Kardon Onyx Studio 3

For information, the bluetooth connection between an IPhone and the wireless speaker works fine!

We deconnected and connected many time between lenovo yoga and the speaker without results.

Any idea please to solve the trouble between lenovo yoga and HK Onyx Studio 3?
thank you.