Chosen Solution

My laptop seems to heat up very quickly while I use it and it eventually shuts off. After waiting for a bit and turning my laptop on it repeats the same thing.

Your fan may be failing. I would listen to see if you can hear the fan running when the computer is performing a task. If the fan is silent, it may need replacement. Try following this guide: Acer Aspire 5742 Cooling Fan Replacement

i think you have to clean your Laptop here a teardown instruction guide for your laptop http://www.insidemylaptop.com/how-to-dis

same problem here .. i opened up the laptop cleaned it new thermalpaste (cpu - gpu) replaced the old thermalpads with new ones the cpu fan is working just fine (speeds up speed down) BUT in 10 minutes shuts off even in bios screen ! any ideas? thanks ! the laptop is Acer Aspire 5742