Major packet loss

First lets start with I have reset and restarted my modem/router a hundred times. I have replaced every single piece of equipment on my end including my motherboard. It is not on my end. 

Every 10-15 minutes my internet connection dies and then restarts in about 10 seconds. I reset and manually entered a DNS without any help. I also reset my TCP settings, with no help. Finally I downloaded a ping/packet loss monitoring software and when my internet dies, I get 100 percent packet loss. I have read another forrum post where it was a bad Xfinity server that was causing the issues, and that is what I'm thinking, because there is simply no way that it is on my end. The only thing that in unique about my setup is that the Xfinity rep who installed my internet needed to use a amp to boost the signal. So please can someone help.    

I have screenshots showing the packet loss.