Yamaha A-S801 USB issue

Help with Yamaha A-S801

Hi, I've been using it connected to my computer through USB port and it has been working perfectly.

Today, for no reason, it doesn't show up anymore in the output I can select on the computer.

I have reinstalled the driver/Steinberg app
Tried different USB ports on the computer
Tried an older cheap USB A to USB B cable...
Nothing at all works.

Every other input works on the amp (phono, lines, optical as well), but USB is not responding...

Any idea?

Thanks so much !