If you’ve got a signal of overheating from your laptop, you should check with temperature monitoring programs. Many cases of overheating caused by GPU / graphic card. So before sending your notebook to service center, you should run a test first and confirm that the GPU is the culprit. One simple utility you can try is DX9 Real time GPU Stress Test 1.2. Let it run for 10 minutes and see what your GPU temps are.

Download DX9 Real Time GPU Stress Test 1.2 here.
Physical Check for Overheating
Other than software tests, you should also check for physical blockage which causing overheating problems, such as dust in vents, heatsink/pipes not properly secured, fans not working correctly, or improper use of where to use the notebook.
You should always use your laptop on clean, hard, and flat surfaces, but never on beds, couch, or laps.
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[...] might causing this kind of problem as well, so be sure to check this issue. We have an article on laptop temperature monitoring, so be sure to read those [...]