AMBE Server Transcoding DStar DMR


I'm install an AMBE Server with two USB ThumbDV on raspberry pi for my XLX105.
The transcoding DStar DMR work in few time and stop.
When transcoding working the light USB ThumbDV blink.
When transcoding does't work the light USB ThumbDV not power.

I must be restart my AMBE Server and transcoding work not long time 5 or 6 mn

Somebody know why ?
What do i do ?

Thank you
73's Christophe 

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