Macbook Pro Ethernet heating, why?

I am a Mac newbie and I have a new Macbook Pro, 13 inches, mid-2012.
I used the Ethernet connection for wired Internet in my dorm room; but after using it for half an hour or so, the Ethernet port and the area nearby, started heating up. After it got considerably hot, I plugged the Ethernet cable out.
The cable is a CAT5e (not CAT6 for gigabit ethernet) and a rather cheap one, so I sincerely hope that this is the reason for the heating problem. Is it so? Any ideas?
Thank you in advance, folks.

I am definitely not a technician and not a Mac expert because I have just been using a MacBook Pro for just about one year. However, I have noticed a pattern. I have had three irritating problems with my Mac. One is the one discussed in this thread; the occassional restart when I have left my Mac for a few hours. A second was that my fan stayed on and killed my battery when I had closed my lid and it was supposed to have been put it to sleep, and the third was that my Mac comes back from sleep with a gray background when I am using two monitors. The problem in this thread is the most serious because I have lost data from this problem. As I looked for solutions for all three, I found suggestions to reset the PRAM. I know this fixed my problem with the fan continuing to run. However, it is more difficult to determine if this temporarily helps with the other two problems or not because they are more random and less often. However, all three are definitely related to when the Mac goes to sleep incorrectly. I suspect that all three problems may have the same root problem.

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