MC7304 loses mobile connection and won't auto-reconnect until power cycle

try this and see if AT command port is enumerated:

  1. download the GenericDriverSetup_5087.exe from SOURCE website
    https://source.sierrawireless.com/resources/airprime/software/airprime-em_mc-series-windows-drivers-qmi-build-5087/#sthash.YyNMMlJJ.dpbs

  2. open a folder and put GenericDriverSetup_5087.exe and Configuration.ini together

  3. open Configuration.ini and add the following:

[Default Values]
CHECKFORDEVICE=0
LOCATIONDRIVER=1
WIN8LOCATION=1
USBCOMP=08

Other user can make it work: