Good news. Looks like I have solved the problem. As a last resort I have bought another one wi-fi receiver, third one. It has
Realtek RTL8763BW chip and
two antennas.
And finally all works fine. I have spent some hours, using Bluetooth
headphones, waiting for problems, but they hadn’t occur. Small problem
is that LTS Kernel 6.1 doesn’t support this device, so I have used
Liquorix kernel, which I have installed earlier. Though, I don’t need
this kernel, as it haven’t helped me with sound interrupts, which was my
hope at first. So… I bought more old Wi-fi receiver with
Realtek RTL8761BUV chip with antenna and it also works fine, and also works with stable 6.1 kernel.
I am glad that situation found its resolution, though it is strange for
me that USB-dongle Bluetooth receiver (I don’t know the exact model) and
receiver on an internal wi-fi adapter (AX 210) have worked so poorly
both. Though I was in the distance not more than 2 meters from receiver.
Thanks for help