My basic image on my RPI3 is hros1-v3-rasbian-jessie-12-09-16.img

All communications are good ( dxl_monitor in reference )

But after one apt-get update and upgrade ( classical with RPI, I do often on alls of mine, other applications )

After one long upgrade, all communications will be erratic with the Arbotix Pro ( many fails )

So alls communications are unusable, and all my projects are unusables too..

Surely you have also encountered this problem. But I do not know, what "good" update causes, this slowdown on the USB port, which ultimately causes problems.

I (We) need uninstall something who make the trouble, But I do not know which one

An Idea ?

Thanks for your help.