Troubleshoot

So my previous Modem/Router suddenly began to constantly reboot itself over and over again, I just assumed that it has dug its own grave. So I went out, bought a new Modem/Router and this is the C3000. Whenever I attempt to connect to the internet it starts off with a solid upstream and downstream then the internet light begins blink. After about 15-20 seconds or so of that light blinking it turns off and the upstream and downstream lights begin to constantly blink and it will just continuously stay like that. What could I do to possibly fix this issue?