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The WiFi at home becomes slow at night, and you don’t even have a slow device at home? It's probably your neighbors who are occupying your line. I wrote down the investigation process.
The WiFi at home slows down at night, and even if you test the speed or change routers, you can't find the problem. Most likely, it's your neighbor's WiFi that's squeezing the same channel as yours. WiFi is a one-way street where you listen first and speak later. Even if your neighbor on the same channel sends slow packets, you have to queue up. I used my mobile phone to scan the channel distribution in the building, and moved 5G to 149 and 2.4G to 1. The evening peak speed doubled directly. The whole process of troubleshooting and implementation is written here. ...
