Thanks for writing into the forum!
From your screenshot it looks like you have low level packet loss (2%) starting at hop #2 and going through to the final hop. While this isn't a very high level of packet loss any
consistent packet loss signals a possible network issue. You might not be able to tell while you're browsing or watching Netflix but with online gaming you could certainly notice.
Somewhere between your router and Comcast's first device there is an issue. It could be within your network between your router and where the cable comes into your building, the cable from your building to the street, or at Comcast's first device (188.8.131.52).
If I were you I'd plug directly to my modem with a known good ethernet cable and run pingplotter and see if you get the same results. If you do, then call Comcast and ask them to check the line to your house and that device (184.108.40.206). Offer to show them the PingPlotter results as a share page
Good luck and let us know how it goes, we love hearing our customers stories!