New laptop will not hold Wi-Fi

Got a top of the range Samsung laptop off my sister who didn't need it, only a month old and she says she never had any trouble but I can't seem to get it to hold onto my Wi-Fi connection. It drops out every couple
of minutes and the only way to get it back is to click forget network then put the security code in again, I have no problems keeping connection on my iPhone, Xbox, old laptop, kindle or anything else, just the laptop, why!

Get it checked because under warranty & free

Sorry I don't know

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