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Get a wifi signal analyzer app and check the wifi signal where you're having problems. They are free if you have an Android phone, not sure for iOS.
It could be that a neighbor got a stronger wifi that's interfering with your signal downstairs. A wifi analyzer will tell you signal strength at your location and also which channels are being used by other wifi near there. Sometimes switching a channel helps.
Also try a driver update for the wifi adapter in your laptop. Do a clean install of the driver. Sometimes removing the wifi network and re-adding it helps also. And yes, reboot everything first before doing anything else.
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