buzz noise on master LR when insert USB stick

Qu Qu Troubleshooting
1

Hi everyone,

Does anyone experience buzz noise on master LR when insert USB stick into QU-Drive USB port. It happens when the board is detecting the USB key (light on the usb key flashing).
Just wonder is it a bug or hardware problem???

Alex

2

I tried this tonight with just headphones. Did not hear any buzz.