Cracks when using Bluetooth with Pro V3

Dear All,
Since using the latest Firmware version with the Pro V3 board, I get very annoying cracks when streaming music with Bluetooth.
I tried different power supplies using the USB connector or the +5V connector, I tried using headphones with the mini-jack output, or using an amp on the line out connector of the board, and even using the external DAC board.
I even tried another iPhone, or to set music compression to highest of to lossless.
I tried 4 different Pro V3 boards.
But I still get the cracks that start approx 10 seconds after beginning the streaming from my phone.
Anyone has experienced the same problem? Is it linked with grounding or shielding?
Can anyone suggest anything useful I could try to solve the problem?
Thanks to all :slight_smile: