PfSense not being nice with my usb 4g modem

so, i installed PfSense on top of my old windows server router to make the network more stable, it has worked after buying a y-adapter for the usb since 500mA is not enough for the modem and i had to plug it into its own charger as well.

but the problem is now with the PfSense communicating with the modem, its a Huawei e5372 and the network adapter keeps dissapearing in PfSense, only way to get it back is to either physically unplug and plug it back in OR to reboot the whole machine every few minutes.

please help, this is horrible :C