The only thing you can do personally is to try power cycling the modem, though with this kind of issue I don't know that it will help. To do so, unplug the modem, wait a minute, then plug it back in. Then wait a few minutes to give it a chance to be fully back up and running. It might also be a good idea to ensure that the coax cable connection at the back of the modem is at least finger tight. It doesn't need to be tool tightened, but it shouldn't be loose.
Chances are there's an aiming issue or some kind of cable issue. The reps can run remote diagnostics to see if they can tell what's going on. Hopefully you'll hear from one of them soon.
If you don't want to wait for a rep here to reply, you can try calling the customer service line, at 866-347-3292.
