I have the same issue. Did you manage to fix it?

@reidfo The issue is that an unsupported band is being used by the modem and causes it to crash and reboot. It's a bit more involved but that is the gist. I got a revised firmware that appears to have resolved it. I suppose I could PM the fw. Not sure if pycom would frown upon sharing. I would expect this is resolved in the next release after 1.18.2.r3.

@recurracy If you mean Expansion board - yes, RTS and CTS jumpers must be removed for modem communication. https://docs.pycom.io/gettingstarted/connection/fipy.html When using the expansion board with a FiPy, you will need to remove the CTS and RTS jumpers as these interfere with communication with the cellular modem.