[geekmaster]

I am curious if serial connections have a similar problem to the ubuntu USB network dropout problem:

On my ubuntu system, nmcli caused USB to drop about 30 seconds after a connection. I uninstalled nmcli from my host PC, but now when I reboot it I need to start the connections manually (on this computer, I use "sudo ifconfig eth2 up; sudo dhclient eth2"). That prevents the dropped USB network connection.

Alternatively, I previously used my "mntusb" script (see the K3 index wiki), which prevents mntcli from dropping the connection.

Or the reboots could just be the watchdog timer in the kindle mentioned elsewhere by knc1.