uTorrent shouldn't be a problem. The torrents you download with it are the only things you should be worried about. FeralHeart shouldn't be a problem either, but it all depends on the computer you have.
About the internet, Most laptops also come with an ethernet port built in, however there are also some who dont as well. If you are constantly on the move with your laptop, then an ethernet cable is not for you. However if you just mostly stay in one place, then it might be something to consider getting.
Example: My Wifi at home is great, and usually peaks around 20 Mb/s (not sure, I havent tested it in a long time). However my desktop is using an ethernet cable, and I've seen my download speed peak to around 200 Mb/s (this one I'm sure of).
Then again, it also can be your location. Like someone living in New York City won't have any issues with their internet connection if they are equipped with the proper router. However someone living in a small town in the middle of no where in Texas, for example (nothing against Texas, just for the sake of obscurity), will have a harder time with their internet speed, if they were to have the same equipment as said person in NYC.
Also if you are crashing, and not just disconnecting, then you should tell us what the crash message specifically says (As in screenshot it). Maybe that will give us a clue to what else is going on.