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That might be bad design, true... and it is not good. Overheating in an electronic device can 'burn it out', leading to sudden complete circuitry failure.
There is one thing to check on: Look at the CPU usage on the Surface Pro 3. Is it always 100 % ?
If so, that is abnormal, even pathological. A good computer should be at continuous-100-% CPU usage, rather rarely or in obvious times of multiple high usage / overload.
How do you determine the CPU usage? that depends upon the Windows version... assuming your Surface Pro 3 has Windows 10, you do the following:
Go to Task Manager (Ctrl-Alt-Del keys, then choose Task Manager, ought to work)
Then go to the Performance tab.
Then click on 'CPU' on the left. A graph of the CPU usage for approximately the last 70 seconds or so, should be displayed.
If it is continuously at 100 %, your software is either infected by a virus, or needs a little work. I can instruct you on what to do and how to fix it, if it's just software misconfiguration or something minor... and I can instruct you how to scan for and determine what virus or malware it might be, and hopefully eliminate it, also... for the price of this JustAnswer.com question.
Let me know, please, so that I may instruct you further with specifics of what to do, as appropriate.