Help!

So as most of you know, my mom bought a wi-fi thing for herself for mother's day so i could use the internet on my laptop and Brian and I wouldn't fight over it. It was fine at first, but slowly and more and more the longer we've had it the more frequently it will just randomly kick me offline. The internet connection on the other computer will be fine, but it will cut out on the wireless connection. Does anyone know how to fix this or what may be wrong? It's a huge pain in the ass and especially if there are people online who I'm hoping will talk to me or something it freaks me out and if I'm in a bad mood and need to update or something it just adds to my anxiety. Also, please keep any explanation or advice as simple as possible. I'm a complete fucking dumbass when it comes to computers, so please keep out any and all technical jargon where layman's terms can be used instead. Thank you much! I know that there are computer people on here that probably know what's going on!