Unplayable gaming. Tried every solution I can possibly do on my end.

Hello,

Problem

I am getting frustrated because for about a month now I cannot play specific games, for example, Overwatch. I get constant disconnections, and it completely drops the connection on that device.

Solutions I have tried

I have an Ethernet cable connected

Restarting the router multiple times

Factory resetting the router

Updating network drivers

Tried different ports on the router

Different Ethernet cables 

Different devices entirely

Called Xfinity, and they troubleshot it, but nothing came of it

Tried vpns to rule out routing issues

I have ran a WinMTR test and these are the results:
|------------------------------------------------------------------------------------------|
|                                      WinMTR statistics                                   |
|                       Host              -   %  | Sent | Recv | Best | Avrg | Wrst | Last |
|------------------------------------------------|------|------|------|------|------|------|
|                                10.0.0.1 -    1 |  338 |  335 |    0 |    0 |   12 |    1 |
|                          10.112.235.234 -    1 |  338 |  335 |    5 |   14 |   29 |   16 |
|po-53-rur201.santamaria.ca.sfba.comcast.net -    2 |  334 |  330 |    6 |   15 |   35 |    9 |
|po-200-xar01.santamaria.ca.sfba.comcast.net -    1 |  338 |  335 |    5 |   15 |   35 |   17 |
|po-3-rur101.santamaria.ca.sfba.comcast.net -    2 |  334 |  330 |    5 |   14 |   35 |   10 |
|ae-228-rar01.santaclara.ca.sfba.comcast.net -    1 |  338 |  335 |   10 |   21 |   57 |   19 |
|be-299-ar01.santaclara.ca.sfba.comcast.net -    1 |  338 |  335 |   11 |   21 |  171 |  120 |
|be-36321-cs02.sunnyvale.ca.ibone.comcast.net -    2 |  334 |  330 |   11 |   20 |   39 |   13 |
|be-2312-pe12.9greatoaks.ca.ibone.comcast.net -    2 |  334 |  330 |   16 |   23 |   53 |   17 |
|                   No response from host -  100 |   70 |    0 |    0 |    0 |    0 |    0 |
|              ae1-br02-eqsv5.as57976.net -    1 |  333 |  330 |   63 |  107 | 3518 |   73 |
|         et-0-0-4-br02-eqla1.as57976.net -    2 |  326 |  322 |   64 |  131 | 3961 |   68 |
|                   No response from host -  100 |   70 |    0 |    0 |    0 |    0 |    0 |
|         et-0-0-1-pe01-evch1.as57976.net -    2 |  334 |  330 |   64 |   72 |  113 |   66 |
|                           24.105.62.129 -    1 |  338 |  335 |   63 |   71 |   95 |   68 |
|________________________________________________|______|______|______|______|______|______|

I really need someone to help me solve this cause I have tried everything I possibly can. I have a theory that it's the Xfinity Gateway, since it is 5 years old and likely degrading at this point. I have the XB7CM model.