Xbox/wifi comcast conflict issue

Question

Let me start this by saying I really don't know I'm trying to learn. Ok now that's out of the way I've noticed there's a post from a comcast employee about a conflict between xbox live and comcast that's not allowing some ppl to play over wifi network. My question is if comcast or isp's are not able to effect or control wifi speeds only hardline how can 1 game or certain games be blocked but other devices or even other games have no issues?         I'm truely trying to understand here I have bad wifi problems and have been through all techs/ ideas anyone can suggest. No one has an answer. They all say my equipment should have no issues. I think its something on comcasts side simliar to this xbox issue. As in there's something in or associated with my act that's effecting my wifi. Everyone I talk to says there is no way to effect or slow or even stop my wifi withouth effecting my hardline, but this issue with comcast and microsoft admits there is some form of wifi control beyond the hardline. I'm not looking for a debate just really curious here.

Answer 1

Cool thanks for response! I have been through all steps possible to reduce interferance literally all. I can tell what equipment I have seeings how this post is getting more help than my actual help request. I currently do not have comcast gateway, but comcast is basically telling me its only way to get my wifi speeds So I ordered one to try local office only has old units.  I have been thru 3 complete upgrades to try to resolve this issue. I started with my own motorola/arris sb6850 after a month a ph tech thru comcast sugested it maybe a bad unit so willing to try anything I take back get replacement. I use for week to make sure no change wifi still 50% of direct connect 2ft away from modem/router. Then I give in knowing gateways don't have wifi power of separate router.    I return gateway pick up netgear cm400 modem and netgear ac band r6300 router. I again get all set up check direct connect all good wifi still 50% of direct. This time I try netgear support after they have me change some internal settings and try for the usual 48 hrs still no change. Netgear then tells me wifi is bad in unit. Reluctant to believe I have yet 3rd bad wifi in my stuff I still listen. I then return R6300 router and pick up netgear nighthawk go thru same process wait week call support ect. They netgear then tells me I have another bad wifi in router. Keep with me now that's 4th bad or defective unit supposedly.    After over many hours of netgear support I decide rather than just return "defective" router (I don't think it actually was). I return modem as well. This time I get motorola/arris sb6121 modem, and ASUS rt-ac68p router (not a cheap unit). After all set up thru comcast and asus still no change. Direct connect I'm still getting 100mbps wifi 50 or under usually under. Again these test are within 2ft of router with no interferance and nothing else connected or running direct connection. I call comcast "tech support" again they say I need gateway unit only way to have wifi speeds and rule out my equipments supposed possible conflict issues with each other even though I fully checked. I even tried comcast wifi "support" few days ago this person suggested it was just a speedtest site being incorrect even though I use xfinity speed test, and ookola (speedtest.net) both of with powered by ookola. Plus I tell person its not just numbers if I have 1 streaming unit I have slow lagging issues on other devices. If I truely was getting 105 or 100 mbps or even the 50ish I'm getting according to tests this should not be happening.      This is my annoying frustrating true story. Tomorrow or next day my gateway unit from comcast will be here even though its nothing compared to current equipment. Oh I forgot to mention I've had multiple techs come to my home at least 6 probably 10. I have irratated many ppl trying to get this issue resolve through comcast. I'm polite but def frustrated.