I have an Arris Surfboard modem and a tp-link network switch with my X55 Pro Deco setup. 

I have my network switch and my router connected to my modem ports

and I have my other 2 Deco's hardwired to my network switch. 

Any time my power goes out or internet goes out my router will not reconnect back to the internet. 

Sometimes I could use a MAC clone and I could manually type in my DNS server. 

I just can't figure out why it's not registering to my router from the modem automatically. I feel like it's a hardware issue with the actual router but I'm not sure. 

Any ideas?