What is the problem with my PC

This might seem like a huge complaint paragraph, but I'm just genuinely curious what's wrong with my rig. For starters, my Xbox controller will, on occasion, disconnect and I have to restart my computer to get it to connect again, and even then it will sometimes not work. This isn't too big of an issue because I've switched to wired for now, just wondering why it's doing this. Next, this may just be a COD problem, but I always have issues on the loading screens, like getting stuck on "connecting to online services" or "waiting for relay". These make me close the game out and restart my pc to fix them. I'm so tired of constantly getting interrupted by having to restart my computer every 15 minutes while online gaming. It is just COD as well. I have like 300 mbps download speeds (wireless). Please, please, please, please if you know anything on how to solve any of these problems, let me know!