I am using the TRB140 with a standard SIM card. The state of data connection is connected. There is outgoing traffic, but 0 bytes incoming traffic. APN ist set to auto. I am not able to ping for example google.de from the TRB140 command line interface. If I change the APN from Auto to "internet.telekom.de" it works as intended (incoming traffic and google.de can be pinged). This behaviour does not occur every time, only about 1 of 3 times after the SIM has been changed.
What could be the cause?