There are two main causes dead spots – distance and barriers

The longer one moves away from the router, the weaker the WiFi signal becomes. Beyond a certain radius, the WiFi coverage ceases. This will be the case in large/multi-storey buildings. Also, the primary router supplied by the ISP might be of a poor quality, compromising its signal range.

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Barriers come in two main forms namely:

Concrete, Dry-walls and different construction materials

Numerous devices that share the same frequency bands with the WiFi