Maybe your router has malfunctioned and has become unable to emit the Wi-Fi signal as it used to. If you tried everything to fix it, including placing it closely to the laptop, smartphone, or any other device, but without success, consider replacing the router with a new one.
Maybe your router is weak and can't handle a huge user load (too many users connected to it), or maybe its range is shorter. If you tried all the other options to improve the signal, but you failed, consider buying a router that offers a long-range signal and that would support many users connected to it.
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