Default Intermittent Internet Access when not on WiFi

I've recently flashed to Paranoid Android (CM11 base) and when not on Wi-Fi I only get intermittent internet access. (Phone calls and sms still work correctly).

I live in a 4G area, so sometimes the connection strength icon will show DC, H+ or nothing at all and just bars. Cycling the radio on and off works sometimes, and when it does connect it connects fairly steadily.

Phone model is D6503, and country is Australia. I created a backup of the stock ROM using TWRP that came with the phone, is there a way I can take the config files from there and flash them? Would that help with my issue or is this a known CM11 issue with the X2?

Thanks kindly!