Our neighbors just installed one of the wire-free security systems in their house, after which WiFi on that end of the house ceased to work, full stop . For $22 from Amazon, we purchased a 'signal booster' that solved the prob lem quickly and easily. Our neighbors offered to pay for it, but we decline d. They are very good neighbors, and we needed to do something anyway as th e distance from one end of the house to the other is just under 60 feet. Ad d 11 feet floor-to-floor, and it adds up. Put another way, the west side of our house is closer to our neighbor than to our WiFi device.
But, it could be something as simple as that - a system nearby that is step ping on your network. And, that can be anything from a Roomba to a Nest the rmostat - or one of the new wireless security systems.
Our very-vintage desktop is hard-wired and has no issues at all. The rest o f the devices (cell phones, laptop and tablets) are WiFi, and fine, now, wi th the booster.
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One of these.
Sometimes, one has to quit whining and get with the program.
Peter Wieck Melrose Park, PA