Default Signal loss

I'm on optimus pro 4.4 with dorimanx 5.1 kernel and lately I'm not getting service anywhere like places I used to get LTE I get nothing but a big old x and the signal goes in and out sometimes I get it sometimes I don't..any ideas belIeve l before I try going to stock again? Should I reflash the modern again? Also can I use jb modem on kit Kat I know my bootloader is jb :/ please and thank you

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