Have been fighting this very same battle for months. Powering off the TG862G makes xfinity wifi disappear as well as (of course) my own private wireless network. Arris technical support claims this model not capable of providing "guest mode" but one of their published spec. sheets clearly has a "Yes" in the column of features labeled "Guest Mode Capable". Who do we believe? I found it interesting that the first two digits only of the MAC Address are diiferent between xfinity wifi and my own private wireless network at identical signal levels using same sniffer program inSSIDer. Nowhere in the Arris gateway setup facilities is there any ability to separately turn off just xfinity wifi, only Wireless enable/disable as an entire block. Comcast MUST have found a way to do a proprietary firmware force download on my personally owned TG862G without any trace of it in the setups.
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Replying / actually UPDATING my own message. Accurate description of problem was unable to turn off xfinity wifi hotspot (erroneously stated while in bridge mode), even while indicated as "disabled" online on My Account page https://customer.xfinity.com/#/settings/security/hotspot.
I decided to persue further and after literally a mostly heated hour and twenty minute session with a female 'Xfinity Internet Specialist' on the phone (cell phone after rebooting gateway was going to occur) and several "tools" were attempted, activated and toggled - suddenly and magically the hotspot carrier from my Arris TG862G disappeared from the 2.4 GHz airways at my home. The closest detectable hotspot is now down in the -85 to -90 dB range, and obviously not coming from my gateway and has a totally different MAC address. When asked exactly what magic tool was used to actually deactivate the hotspot from my device I was told it was not accessible by me, the owner of (and Administrator of) the Arris TG862G - only by them at Comcast. That doesnt seem right but bottom line is, after literally months of failure to achieve the goal of freedom from unauthorised hotspot, persistence FINALLY paid off. Classic case of "Squeaky Wheel Gets The Grease"!!! I encourage anyone in the same boat to wage the same fight but, be prepared for a real battle. In the end, you WILL WIN. Good luck to you all