lattepanda 3 delta and Sim7600G-H-M2 --> ttyUSB2 disappear after first configuration

Hello everybody,

I successfully configured the modem for my lattepanda with AT commands on minicom -D ttyUS2.

I did not installed any driver.

The strange thing is that at the end of the configuration and after I am able to communicate by lte-internet I cannot communicate anymore with the modem, because ttyUSB2 disapears.

I cannot understand that.

Is there any reason for that?

It would be normal to have ttyUSB2 to talk with in case one wants to change some configuration... I guess...

thank you for your help

ed