I'm not a fan of converged units for most things that includes all in one PC's. If one part fails the whole system usually goes along with it. I prefer keeping separate devices that can be dedicated to specific things.
When I had Charter phone installed the technician put in a splitter and ran a separate line to an Arris eMTA.
I'm not sure what is causing your issue? Best I can tell you is to call support and go from there.
Best of luck