USB-CDMA Modem won´t work after shut dowen by my PB

I´m using a VTION V1810 CDMA modem to connect to the Internet when travelling.
Works fine, only after the connection is shut down by either the PB or due to inactivity timeout after 30 min, I can not connect anymore.
I tried several procedures like connecting to another USB port, setting up a new connection and so on.
Just after some time if the device is not plugged in, I get lucky and it connects again as if there was no rain in this world...
Any ideas?
I already learnt that I always have to connect it to the same USB port, and that it is luck if it works over a hub.

Sorry, I was not clear enough. The modem had a problem that involved it not hanging up. I wondered if there might be a similar process that was occurring with the CDMA modem.
With the CDMA modem I use, there was no script/driver but I connect using the "null modem 115200" setting (in modems). I see there are a few other modem settings in there.
As a point, have you updated the OS recently? Sometimes this will mean that a driver does not integrate properly and we would have to wait until the maker updates the driver too. It might be worth your while to try the other settings.

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USB-CDMA Modem won´t work after shut dowen by my PB

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