I have Xfiniity Internet at my house, which is a duplex. The wifi has been working fine for around 7 months, then in the last month it started to get choppy in the living room. At that time the router was in my bedroom. When I say choppy, I mean that some days the wifi would work fine, other days, no device was able to keep a wifi connection for more than a few seconds, while the device was in the living room. A device would connect to the wifi network, but the connection would drop after a few seconds. Sometimes it would be enough to load a few websites, but that's about it. Devices in the bedroom had no issues.
Over a few weeks this kept getting more and more frequent, and now devices in the living room are unable to ever keep a connection to the wifi for more than 30 seconds (at best).
My initial thought was that the 2.4ghz wifi channel was having issues, as the devices in my bedroom were close enough to the router to connect using 5ghz. I went and swapped out the router with a new Xfinitiy router, but that did not fix the problem.
I then moved the router to the living room, but the results are the same! I can be 4 feet away from the router, in the living room, and I am unable to keep a wifi connection. At the same time, the devices in my bedroom do not have any issue connecting to the wifi (with the router still in the living room).
Results from a wifi scan (ran in the living room around 8 feet away from the router) show that my wifi network has an RSSI of -42 and a noise level of -91.
I have changed the wifi channels to be statically set, I tried changing the names of the 5ghz and the 2.4ghz to be different from one another. I'm not sure what else to try. I don't believe that anything has changed in my house in terms of redecorating furniture, new electronics, etc.
At this point I suspect there is interference in the living room area, probably from my downstairs neighbors, but I am unsure. The downstairs neighbors did sign up for a wireless Internet provider (https://www.common.net/technology/) who installed a dish on our roof. It seems possible that the connection between the dish on the roof and the router that they must have downstairs might be causing the issue...
The thing is, the problems with connecting to stuff in the living room started out sporadic and has gotten worse over time, which also makes me think maybe it's not related to the wireless Internet provider's equipment, as that likely would have had an immediate impact, not a gradual one.
Oh, and this is happening on multiple devices, laptops, phones, and a Roku TV. The same devices work fine while in the bedroom.