My PC is fine, there's no problem with that. It runs everything smooth as ever. It's only the internet connection that's the problem. And it's safe to say, I just played an online game, and the phone is not interfering with the connection. I turned it off and it still happened 3 times.
Also, using the 5Ghz is worse than 2.4 for me, since the router isn't in my room. it's 5 meters away through a wall.
Alright guys, thank you for the answers and all the help. I found a solution. I messed around with the adapter options and put the wireless mode on IEEE 802.11a/n strictly. It no longer shows internet connections that are not 5GHz and the connection is perfect. I also changed the roaming sensitivity level to high, but I'm not sure if that's what fixed the problem. Either way, the problem's gone for now. I'll see if it returns.
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