Just do: echo 'on' | sudo tee /sys/bus/usb/devices/1-1.2/power/control
It has completely resolved the issues for me. Set it up to be set on boot and you’re golden. May affect power consumption a little bit but it hasn’t been noticeable enough for me.
EDIT: As per this thread it may be fixed in a new kernel Modem woes and reliability - #86 by lo0