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Restart the router
The router sometimes makes the Internet connection slow, unexpectedly. Other times it doesn't reconnect to a network automatically. There are lights on every router which should tell you whether the internet connection is active or not (i.e. if you can browse the Internet or not.
If you notice that the lights are not working properly, the best solution is to restart the router. The easiest way to restart the router is to unplug the power cord from the outlet and wait for a couple of minutes. After that plug it back in the outlet and everything should be fine.