Stability of USB port

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Stability of USB port

Hi all,

I'm not sure that this is a CQR problem, but...

Very often, when I start CQR, the WK1EL keyer is not connected, or more exactly, the USB port is not always the one of the previous session.
So with a "ls /dev/tty*", I check the used ports, and I change it in the preference panel, and everything is working fine, but this is annoying.
Strangely, the link to the rig is stable. I had a problem once, but it was solved by a restart of Linux.

For info, I'm with Debian Jessie, and CQR 1.8.2.

Thanks in advance for any hint.