I can't get Wi-Fi on my iphone in my bedroom?

My bedroom is no more than 35 feet away from my router in the living room. All of a sudden, I'm not getting Wi-Fi on my iphone. Its has 1 bar in the bathroom which is between the living room & bedroom. When I'm next to the router I get full signal. Why is distance affecting Wi-Fi signal? What can I do? I can't really move the router closer to my room…

It's saying a straight 100 metre if Wi-Fi router is kept inside a room and walls make an obstruction, actually Wi-Fi is an electromagnetic waves so need air medium so a Wi-Fi inside a room is incapable of sharing but it might work when you keep near windows detach the antenna and place it outside the window it might work

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