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Well the keyboard could have moisture in it? A key connection can also be stuck. Keyboards do wear out. Your only solution really is likely to get an external keyboard. You can try cleaning it or drying it out. Testing each key to find out the problem. Cant tell you from here.
The computer overheating could actually be design. It could be a desktop processor.
I would however make sure the processor is not overclocked.
That will be somewhere in bios set up. Go there anyway, and see if you can turn the processor speed down and see if that will solve the problem. You might not be able to. You might have to find your bios manufacturer, and download a non laptop bios. Laptop bios usually dont allow you to mess with the speed.
Try to find where air enters the case ( usually it is underneath) and make sure there is space under the laptop when ur using it.
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