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When I use my laptop for long periods of time, it begins to get extremely hot, especially underneath. Every once and a while I notice when it gets to this extreme temperature, it will also crash and I have to restart. Can anyone help me?

Your machine is overheating and tripping the safety shut off. First thing to do is to open it up and blow out the fan. Then remove the fan and clean the vent. Next, it is probably due for new thermal paste to help transfer heat. This machine is 9 years old and some of the pastes can dry out and cease to function well. Here’s how to apply thermal paste: How to Apply Thermal Paste And the paste: Arctic Silver Thermal Paste Here’s a video on how to clean your fan: https://www.youtube.com/watch?v=9TZLpQgb

Just Try reseting it.

May have excessive dust inside vents. Try using a compressed air tool to clean out the vents.