pollForTools times out after USB usage between MCU and computer

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x256a3buXplained and atmel-ice are connected together and both of them to computer via USB.

using atmel studio 7.0 on windows 10.

As Atmel-ICE is not detected by atmel studio, I use avrdude to program the device.


Everything's fine until I flash code which sends data from MCU to computer and I open COM PORT to visualise data coming from MCU (note that this works fine).


But the following suggests that I broke something at this point : after this step, I regularly receives this msg from atmel studio :



I think I identified two cases in which this happens.

First case : as soon as I start to flash code while there is already code using USB on MCU

Second case : no special rule, just pops from time to time


Any idea ?