Similar issues with SB6141 signal cutting out on both wired and non-wired connections. Xfinity- device info says unsupported @60mbps but then when i scroll down to supported devices there is an SB6141 in the list. Seeing the request for signal and noise information I've got this clip.
Can't see your pic. Since you are a new poster, it likely needs to be approved by a Forum Admin.
You could try hosting it at one of those free third-party pic hosting sites and post the link to it here.