I am using 4x MC7304 (Firmware revision: SWI9X15C_05.05.61.00 r28313 CARMD-EV-FRMWR1 2015/05/21 23:40:18) installed in Vecow IVH-9008, using Debian Stretch (kernel 4.9.78) and controlled by ModemManager (1.6.4)
One modem self-resets every time after connecting and pushing some data over it (pings).
It is 100% reproducible. In the kernel logs I see the modem disconnects from USB bus only, none suspicious errors.
Is someone else seeing this problem?