Support Assist Bluetooth-Test results "Warning" but no further info.

My Bluetooth Headset just stops working while watchin a Youtube Video and it said that the devise has disconnected.
So I try to figure out whats going on.
First I checked the Device Manager.
The Bluetooth-Qualcom QCA61x4A Bluetooth was already open with an attention mark.
If I open it, the status say "Windows has stopped this device because it has reported problems. (Code 43)".

!!!Here I inserted an image, but it is not shown!!!

So I run the Dell Update and all updates are installed.
I then use the Dell Support Assist and run the Bluetooth Test.
But the result just show "Warning" with an check mark.
No further info.

!!!Here I inserted an image, but it is not shown!!!

How can I test further? What could be the root cause here?
As I had issues, I got a new mainboard in March 2023. That time my PC was still under extended warranty.
Now I'm scared that I got a old refurbished mainborad that time, as I also cannot use my SD Card slot. The SD Card will not lock in. But this I just figured out after the service ended in September 2023.

So I'm quite frustrated.

Hope someone can help me her.

BR
Christian