Samsung Galaxy S4 — My WIFI only works when I am pretty close to the router

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Sep 30, 2016 4:50:04 PM via Website

So my phone fell onto the ground by an accident, the screen broke and I went to a local [not a very trusted] shop to replace the screen. After fixing it and returning home, I found out that my WIFI only works when I am pretty close to the router and that's pissing me off.

Do you think that this might have been due to the fall? or did that shop replace some high copy shit into my phone and stole my original parts? can you please help me?