I have two laptops in the house that have wireless issues.

I have a main desktop were my router is located in my bedroom. I have to laptops in the house running off that. Lately I’ve been having a problem with getting on the internet with the laptop’s only at night or early evening. I’m wondering if people are hitting off of my signal but when I open the network sharing center. I don’t even see my wireless router name listed it’s like it just disapeared. I can see it on the map though it’s so weird. I really hate to call geek squad and be charged for something if I really dont have to. Can someone help me out and get me back online. ty